// Verified using https://dapp.tools

// hevm: flattened sources of ./contracts/2021/12/Proposal21.sol

pragma solidity =0.5.15 >=0.5.15 <0.6.0;
pragma experimental ABIEncoderV2;

////// lib/yamV3/contracts/lib/SafeMath.sol

/* pragma solidity ^0.5.15; */

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath_2 {
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;

        return c;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts with custom message when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

////// lib/yamV3/contracts/governance/TimeLock.sol
/* pragma solidity ^0.5.15; */


/* Copyright 2020 Compound Labs, Inc.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.

2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.

3. Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

// Original file came from Compound: https://github.com/compound-finance/compound-protocol/blob/master/contracts/Timelock.sol


// Original audit: https://blog.openzeppelin.com/compound-finance-patch-audit/
// Overview:
//    No Critical
//    No High
//
// Changes made by YAM after audit:
//    Formatting, naming, & uint256 instead of uint

/* import "../lib/SafeMath.sol"; */

contract Timelock {
    using SafeMath_2 for uint256;

    /// @notice An event emitted when the timelock admin changes
    event NewAdmin(address indexed newAdmin);
    /// @notice An event emitted when a new admin is staged in the timelock
    event NewPendingAdmin(address indexed newPendingAdmin);
    event NewDelay(uint indexed newDelay);
    /// @notice An event emitted when a queued transaction is cancelled
    event CancelTransaction(bytes32 indexed txHash, address indexed target, uint256 value, string signature,  bytes data, uint256 eta);
    /// @notice An event emitted when a queued transaction is executed
    event ExecuteTransaction(bytes32 indexed txHash, address indexed target, uint256 value, string signature,  bytes data, uint256 eta);
    /// @notice An event emitted when a new transaction is queued
    event QueueTransaction(bytes32 indexed txHash, address indexed target, uint256 value, string signature, bytes data, uint256 eta);

    /// @notice the length of time after the delay has passed that a transaction can be executed
    uint256 public constant GRACE_PERIOD = 14 days;
    /// @notice the minimum length of the timelock delay
    uint256 public constant MINIMUM_DELAY = 12 hours;
    /// @notice the maximum length of the timelock delay
    uint256 public constant MAXIMUM_DELAY = 30 days;

    address public admin;
    address public pendingAdmin;
    uint256 public delay;
    bool public admin_initialized;

    mapping (bytes32 => bool) public queuedTransactions;


    constructor()
        public
    {
        /* require(delay_ >= MINIMUM_DELAY, "Timelock::constructor: Delay must exceed minimum delay.");
        require(delay_ <= MAXIMUM_DELAY, "Timelock::setDelay: Delay must not exceed maximum delay."); */
    
        admin = msg.sender;
        delay = MINIMUM_DELAY;
        admin_initialized = false;
    }

    function () external payable { }


    /**
    @notice sets the delay
    @param delay_ the new delay
     */
    function setDelay(uint256 delay_)
        public
    {
        require(msg.sender == address(this), "Timelock::setDelay: Call must come from Timelock.");
        require(delay_ >= MINIMUM_DELAY, "Timelock::setDelay: Delay must exceed minimum delay.");
        require(delay_ <= MAXIMUM_DELAY, "Timelock::setDelay: Delay must not exceed maximum delay.");
        delay = delay_;

        emit NewDelay(delay);
    }


    /// @notice sets the new admin address
    function acceptAdmin()
        public
    {
        require(msg.sender == pendingAdmin, "Timelock::acceptAdmin: Call must come from pendingAdmin.");
        admin = msg.sender;
        pendingAdmin = address(0);

        emit NewAdmin(admin);
    }

    /**
    @notice queues a new pendingAdmin
    @param pendingAdmin_ the new pendingAdmin address
     */
    function setPendingAdmin(address pendingAdmin_)
        public
    {
        // allows one time setting of admin for deployment purposes
        if (admin_initialized) {
          require(msg.sender == address(this), "Timelock::setPendingAdmin: Call must come from Timelock.");
        } else {
          require(msg.sender == admin, "Timelock::setPendingAdmin: !init & !admin");
          admin_initialized = true;
        }
        pendingAdmin = pendingAdmin_;

        emit NewPendingAdmin(pendingAdmin);
    }


    function queueTransaction(
        address target,
        uint256 value,
        string memory signature,
        bytes memory data,
        uint256 eta
    )
        public
        returns (bytes32)
    {
        require(msg.sender == admin, "Timelock::queueTransaction: Call must come from admin.");
        require(eta >= getBlockTimestamp().add(delay), "Timelock::queueTransaction: Estimated execution block must satisfy delay.");

        bytes32 txHash = keccak256(abi.encode(target, value, signature, data, eta));
        queuedTransactions[txHash] = true;

        emit QueueTransaction(txHash, target, value, signature, data, eta);
        return txHash;
    }

    function cancelTransaction(
        address target,
        uint256 value,
        string memory signature,
        bytes memory data,
        uint256 eta
    )
        public
    {
        require(msg.sender == admin, "Timelock::cancelTransaction: Call must come from admin.");

        bytes32 txHash = keccak256(abi.encode(target, value, signature, data, eta));
        queuedTransactions[txHash] = false;

        emit CancelTransaction(txHash, target, value, signature, data, eta);
    }

    function executeTransaction(
        address target,
        uint256 value,
        string memory signature,
        bytes memory data,
        uint256 eta
    )
        public
        payable
        returns (bytes memory)
    {
        require(msg.sender == admin, "Timelock::executeTransaction: Call must come from admin.");

        // timelock not enforced prior to updating the admin. This should occur on
        // deployment.
        bytes32 txHash = keccak256(abi.encode(target, value, signature, data, eta));
        if (admin_initialized) {
          require(queuedTransactions[txHash], "Timelock::executeTransaction: Transaction hasn't been queued.");
          require(getBlockTimestamp() >= eta, "Timelock::executeTransaction: Transaction hasn't surpassed time lock.");
          require(getBlockTimestamp() <= eta.add(GRACE_PERIOD), "Timelock::executeTransaction: Transaction is stale.");

          queuedTransactions[txHash] = false;
        }


        bytes memory callData;

        if (bytes(signature).length == 0) {
            callData = data;
        } else {
            callData = abi.encodePacked(bytes4(keccak256(bytes(signature))), data);
        }

        // solium-disable-next-line security/no-call-value
        (bool success, bytes memory returnData) = target.call.value(value)(callData);
        require(success, "Timelock::executeTransaction: Transaction execution reverted.");

        emit ExecuteTransaction(txHash, target, value, signature, data, eta);

        return returnData;
    }

    function getBlockTimestamp() internal view returns (uint256) {
        // solium-disable-next-line security/no-block-members
        return block.timestamp;
    }
}

////// lib/yamV3/contracts/lib/IERC20.sol

/* pragma solidity ^0.5.15; */

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20_2 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

////// lib/yamV3/contracts/lib/Address.sol

/* pragma solidity ^0.5.15; */

/**
 * @dev Collection of functions related to the address type
 */
library Address_2 {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies in extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly { size := extcodesize(account) }
        return size > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (bool success, ) = recipient.call.value(amount)("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain`call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
      return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        return _functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        return _functionCallWithValue(target, data, value, errorMessage);
    }

    function _functionCallWithValue(address target, bytes memory data, uint256 weiValue, string memory errorMessage) private returns (bytes memory) {
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call.value(weiValue)(data);
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

////// lib/yamV3/contracts/lib/SafeERC20.sol

/* pragma solidity ^0.5.15; */

/* import "./IERC20.sol"; */
/* import "./SafeMath.sol"; */
/* import "./Address.sol"; */

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20_2 {
    using SafeMath_2 for uint256;
    using Address_2 for address;

    function safeTransfer(IERC20_2 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(IERC20_2 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(IERC20_2 token, address spender, uint256 value) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        // solhint-disable-next-line max-line-length
        require((value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function safeIncreaseAllowance(IERC20_2 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).add(value);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(IERC20_2 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: decreased allowance below zero");
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20_2 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) { // Return data is optional
            // solhint-disable-next-line max-line-length
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

////// lib/yamV3/contracts/token/YAMGovernanceStorage.sol
/* pragma solidity 0.5.15; */
/* pragma experimental ABIEncoderV2; */

/* Copyright 2020 Compound Labs, Inc.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.

2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.

3. Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */


contract YAMGovernanceStorage {
    /// @notice A record of each accounts delegate
    mapping (address => address) internal _delegates;

    /// @notice A checkpoint for marking number of votes from a given block
    struct Checkpoint {
        uint32 fromBlock;
        uint256 votes;
    }

    /// @notice A record of votes checkpoints for each account, by index
    mapping (address => mapping (uint32 => Checkpoint)) public checkpoints;

    /// @notice The number of checkpoints for each account
    mapping (address => uint32) public numCheckpoints;

    /// @notice The EIP-712 typehash for the contract's domain
    bytes32 public constant DOMAIN_TYPEHASH = keccak256("EIP712Domain(string name,uint256 chainId,address verifyingContract)");

    /// @notice The EIP-712 typehash for the delegation struct used by the contract
    bytes32 public constant DELEGATION_TYPEHASH = keccak256("Delegation(address delegatee,uint256 nonce,uint256 expiry)");

    /// @notice A record of states for signing / validating signatures
    mapping (address => uint) public nonces;
}

////// lib/yamV3/contracts/token/YAMTokenStorage.sol

/* pragma solidity 0.5.15; */

/* import "../lib/SafeMath.sol"; */

// Storage for a YAM token
contract YAMTokenStorage {

    using SafeMath_2 for uint256;

    /**
     * @dev Guard variable for re-entrancy checks. Not currently used
     */
    bool internal _notEntered;

    /**
     * @notice EIP-20 token name for this token
     */
    string public name;

    /**
     * @notice EIP-20 token symbol for this token
     */
    string public symbol;

    /**
     * @notice EIP-20 token decimals for this token
     */
    uint8 public decimals;

    /**
     * @notice Governor for this contract
     */
    address public gov;

    /**
     * @notice Pending governance for this contract
     */
    address public pendingGov;

    /**
     * @notice Approved rebaser for this contract
     */
    address public rebaser;

    /**
     * @notice Approved migrator for this contract
     */
    address public migrator;

    /**
     * @notice Incentivizer address of YAM protocol
     */
    address public incentivizer;

    /**
     * @notice Total supply of YAMs
     */
    uint256 public totalSupply;

    /**
     * @notice Internal decimals used to handle scaling factor
     */
    uint256 public constant internalDecimals = 10**24;

    /**
     * @notice Used for percentage maths
     */
    uint256 public constant BASE = 10**18;

    /**
     * @notice Scaling factor that adjusts everyone's balances
     */
    uint256 public yamsScalingFactor;

    mapping (address => uint256) internal _yamBalances;

    mapping (address => mapping (address => uint256)) internal _allowedFragments;

    uint256 public initSupply;


    // keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)");
    bytes32 public constant PERMIT_TYPEHASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;
    bytes32 public DOMAIN_SEPARATOR;
}

////// lib/yamV3/contracts/token/YAMTokenInterface.sol

/* pragma solidity 0.5.15; */

/* import "./YAMTokenStorage.sol"; */
/* import "./YAMGovernanceStorage.sol"; */

contract YAMTokenInterface is YAMTokenStorage, YAMGovernanceStorage {

    /// @notice An event thats emitted when an account changes its delegate
    event DelegateChanged(address indexed delegator, address indexed fromDelegate, address indexed toDelegate);

    /// @notice An event thats emitted when a delegate account's vote balance changes
    event DelegateVotesChanged(address indexed delegate, uint previousBalance, uint newBalance);

    /**
     * @notice Event emitted when tokens are rebased
     */
    event Rebase(uint256 epoch, uint256 prevYamsScalingFactor, uint256 newYamsScalingFactor);

    /*** Gov Events ***/

    /**
     * @notice Event emitted when pendingGov is changed
     */
    event NewPendingGov(address oldPendingGov, address newPendingGov);

    /**
     * @notice Event emitted when gov is changed
     */
    event NewGov(address oldGov, address newGov);

    /**
     * @notice Sets the rebaser contract
     */
    event NewRebaser(address oldRebaser, address newRebaser);

    /**
     * @notice Sets the migrator contract
     */
    event NewMigrator(address oldMigrator, address newMigrator);

    /**
     * @notice Sets the incentivizer contract
     */
    event NewIncentivizer(address oldIncentivizer, address newIncentivizer);

    /* - ERC20 Events - */

    /**
     * @notice EIP20 Transfer event
     */
    event Transfer(address indexed from, address indexed to, uint amount);

    /**
     * @notice EIP20 Approval event
     */
    event Approval(address indexed owner, address indexed spender, uint amount);

    /* - Extra Events - */
    /**
     * @notice Tokens minted event
     */
    event Mint(address to, uint256 amount);

    /**
     * @notice Tokens burned event
     */
    event Burn(address from, uint256 amount);

    // Public functions
    function transfer(address to, uint256 value) external returns(bool);
    function transferFrom(address from, address to, uint256 value) external returns(bool);
    function balanceOf(address who) external view returns(uint256);
    function balanceOfUnderlying(address who) external view returns(uint256);
    function allowance(address owner_, address spender) external view returns(uint256);
    function approve(address spender, uint256 value) external returns (bool);
    function increaseAllowance(address spender, uint256 addedValue) external returns (bool);
    function decreaseAllowance(address spender, uint256 subtractedValue) external returns (bool);
    function maxScalingFactor() external view returns (uint256);
    function yamToFragment(uint256 yam) external view returns (uint256);
    function fragmentToYam(uint256 value) external view returns (uint256);

    /* - Governance Functions - */
    function getPriorVotes(address account, uint blockNumber) external view returns (uint256);
    function delegateBySig(address delegatee, uint nonce, uint expiry, uint8 v, bytes32 r, bytes32 s) external;
    function delegate(address delegatee) external;
    function delegates(address delegator) external view returns (address);
    function getCurrentVotes(address account) external view returns (uint256);

    /* - Permissioned/Governance functions - */
    function mint(address to, uint256 amount) external returns (bool);
    function burn(uint256 amount) external returns (bool);
    function rebase(uint256 epoch, uint256 indexDelta, bool positive) external returns (uint256);
    function _setRebaser(address rebaser_) external;
    function _setIncentivizer(address incentivizer_) external;
    function _setPendingGov(address pendingGov_) external;
    function _acceptGov() external;
}

////// lib/yamV3/contracts/token/YAMGovernance.sol
/* pragma solidity 0.5.15; */
/* pragma experimental ABIEncoderV2; */

/* Copyright 2020 Compound Labs, Inc.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.

2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.

3. Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */


/* import "./YAMGovernanceStorage.sol"; */
/* import "./YAMTokenInterface.sol"; */

contract YAMGovernanceToken is YAMTokenInterface {

      /// @notice An event thats emitted when an account changes its delegate
    event DelegateChanged(address indexed delegator, address indexed fromDelegate, address indexed toDelegate);

    /// @notice An event thats emitted when a delegate account's vote balance changes
    event DelegateVotesChanged(address indexed delegate, uint previousBalance, uint newBalance);

    /**
     * @notice Get delegatee for an address delegating
     * @param delegator The address to get delegatee for
     */
    function delegates(address delegator)
        external
        view
        returns (address)
    {
        return _delegates[delegator];
    }

   /**
    * @notice Delegate votes from `msg.sender` to `delegatee`
    * @param delegatee The address to delegate votes to
    */
    function delegate(address delegatee) external {
        return _delegate(msg.sender, delegatee);
    }

    /**
     * @notice Delegates votes from signatory to `delegatee`
     * @param delegatee The address to delegate votes to
     * @param nonce The contract state required to match the signature
     * @param expiry The time at which to expire the signature
     * @param v The recovery byte of the signature
     * @param r Half of the ECDSA signature pair
     * @param s Half of the ECDSA signature pair
     */
    function delegateBySig(
        address delegatee,
        uint nonce,
        uint expiry,
        uint8 v,
        bytes32 r,
        bytes32 s
    )
        external
    {
        bytes32 structHash = keccak256(
            abi.encode(
                DELEGATION_TYPEHASH,
                delegatee,
                nonce,
                expiry
            )
        );

        bytes32 digest = keccak256(
            abi.encodePacked(
                "\x19\x01",
                DOMAIN_SEPARATOR,
                structHash
            )
        );

        address signatory = ecrecover(digest, v, r, s);
        require(signatory != address(0), "YAM::delegateBySig: invalid signature");
        require(nonce == nonces[signatory]++, "YAM::delegateBySig: invalid nonce");
        require(now <= expiry, "YAM::delegateBySig: signature expired");
        return _delegate(signatory, delegatee);
    }

    /**
     * @notice Gets the current votes balance for `account`
     * @param account The address to get votes balance
     * @return The number of current votes for `account`
     */
    function getCurrentVotes(address account)
        external
        view
        returns (uint256)
    {
        uint32 nCheckpoints = numCheckpoints[account];
        return nCheckpoints > 0 ? checkpoints[account][nCheckpoints - 1].votes : 0;
    }

    /**
     * @notice Determine the prior number of votes for an account as of a block number
     * @dev Block number must be a finalized block or else this function will revert to prevent misinformation.
     * @param account The address of the account to check
     * @param blockNumber The block number to get the vote balance at
     * @return The number of votes the account had as of the given block
     */
    function getPriorVotes(address account, uint blockNumber)
        external
        view
        returns (uint256)
    {
        require(blockNumber < block.number, "YAM::getPriorVotes: not yet determined");

        uint32 nCheckpoints = numCheckpoints[account];
        if (nCheckpoints == 0) {
            return 0;
        }

        // First check most recent balance
        if (checkpoints[account][nCheckpoints - 1].fromBlock <= blockNumber) {
            return checkpoints[account][nCheckpoints - 1].votes;
        }

        // Next check implicit zero balance
        if (checkpoints[account][0].fromBlock > blockNumber) {
            return 0;
        }

        uint32 lower = 0;
        uint32 upper = nCheckpoints - 1;
        while (upper > lower) {
            uint32 center = upper - (upper - lower) / 2; // ceil, avoiding overflow
            Checkpoint memory cp = checkpoints[account][center];
            if (cp.fromBlock == blockNumber) {
                return cp.votes;
            } else if (cp.fromBlock < blockNumber) {
                lower = center;
            } else {
                upper = center - 1;
            }
        }
        return checkpoints[account][lower].votes;
    }

    function _delegate(address delegator, address delegatee)
        internal
    {
        address currentDelegate = _delegates[delegator];
        uint256 delegatorBalance = _yamBalances[delegator]; // balance of underlying YAMs (not scaled);
        _delegates[delegator] = delegatee;

        emit DelegateChanged(delegator, currentDelegate, delegatee);

        _moveDelegates(currentDelegate, delegatee, delegatorBalance);
    }

    function _moveDelegates(address srcRep, address dstRep, uint256 amount) internal {
        if (srcRep != dstRep && amount > 0) {
            if (srcRep != address(0)) {
                // decrease old representative
                uint32 srcRepNum = numCheckpoints[srcRep];
                uint256 srcRepOld = srcRepNum > 0 ? checkpoints[srcRep][srcRepNum - 1].votes : 0;
                uint256 srcRepNew = srcRepOld.sub(amount);
                _writeCheckpoint(srcRep, srcRepNum, srcRepOld, srcRepNew);
            }

            if (dstRep != address(0)) {
                // increase new representative
                uint32 dstRepNum = numCheckpoints[dstRep];
                uint256 dstRepOld = dstRepNum > 0 ? checkpoints[dstRep][dstRepNum - 1].votes : 0;
                uint256 dstRepNew = dstRepOld.add(amount);
                _writeCheckpoint(dstRep, dstRepNum, dstRepOld, dstRepNew);
            }
        }
    }

    function _writeCheckpoint(
        address delegatee,
        uint32 nCheckpoints,
        uint256 oldVotes,
        uint256 newVotes
    )
        internal
    {
        uint32 blockNumber = safe32(block.number, "YAM::_writeCheckpoint: block number exceeds 32 bits");

        if (nCheckpoints > 0 && checkpoints[delegatee][nCheckpoints - 1].fromBlock == blockNumber) {
            checkpoints[delegatee][nCheckpoints - 1].votes = newVotes;
        } else {
            checkpoints[delegatee][nCheckpoints] = Checkpoint(blockNumber, newVotes);
            numCheckpoints[delegatee] = nCheckpoints + 1;
        }

        emit DelegateVotesChanged(delegatee, oldVotes, newVotes);
    }

    function safe32(uint n, string memory errorMessage) internal pure returns (uint32) {
        require(n < 2**32, errorMessage);
        return uint32(n);
    }

    function getChainId() internal pure returns (uint) {
        uint256 chainId;
        assembly { chainId := chainid() }
        return chainId;
    }
}

////// lib/yamV3/contracts/token/YAMLogic3.sol

/* pragma solidity 0.5.15; */

/* import "./YAMTokenInterface.sol"; */
/* import "../token/YAMGovernance.sol"; */
/* import "../lib/SafeERC20.sol"; */

contract YAMToken is YAMGovernanceToken {
    // Modifiers
    modifier onlyGov() {
        require(msg.sender == gov);
        _;
    }

    modifier onlyRebaser() {
        require(msg.sender == rebaser);
        _;
    }

    modifier onlyMinter() {
        require(
            msg.sender == rebaser
            || msg.sender == gov
            || msg.sender == incentivizer
            || msg.sender == migrator,
            "not minter"
        );
        _;
    }

    modifier validRecipient(address to) {
        require(to != address(0x0));
        require(to != address(this));
        _;
    }

    function initialize(
        string memory name_,
        string memory symbol_,
        uint8 decimals_
    )
        public
    {
        require(yamsScalingFactor == 0, "already initialized");
        name = name_;
        symbol = symbol_;
        decimals = decimals_;
    }


    /**
    * @notice Computes the current max scaling factor
    */
    function maxScalingFactor()
        external
        view
        returns (uint256)
    {
        return _maxScalingFactor();
    }

    function _maxScalingFactor()
        internal
        view
        returns (uint256)
    {
        // scaling factor can only go up to 2**256-1 = initSupply * yamsScalingFactor
        // this is used to check if yamsScalingFactor will be too high to compute balances when rebasing.
        return uint256(-1) / initSupply;
    }

    /**
    * @notice Mints new tokens, increasing totalSupply, initSupply, and a users balance.
    * @dev Limited to onlyMinter modifier
    */
    function mint(address to, uint256 amount)
        external
        onlyMinter
        returns (bool)
    {
        _mint(to, amount);
        return true;
    }

    function _mint(address to, uint256 amount)
        internal
    {
      if (msg.sender == migrator) {
        // migrator directly uses v2 balance for the amount

        // increase initSupply
        initSupply = initSupply.add(amount);

        // get external value
        uint256 scaledAmount = _yamToFragment(amount);

        // increase totalSupply
        totalSupply = totalSupply.add(scaledAmount);

        // make sure the mint didnt push maxScalingFactor too low
        require(yamsScalingFactor <= _maxScalingFactor(), "max scaling factor too low");

        // add balance
        _yamBalances[to] = _yamBalances[to].add(amount);

        // add delegates to the minter
        _moveDelegates(address(0), _delegates[to], amount);
        emit Mint(to, scaledAmount);
        emit Transfer(address(0), to, scaledAmount);
      } else {
        // increase totalSupply
        totalSupply = totalSupply.add(amount);

        // get underlying value
        uint256 yamValue = _fragmentToYam(amount);

        // increase initSupply
        initSupply = initSupply.add(yamValue);

        // make sure the mint didnt push maxScalingFactor too low
        require(yamsScalingFactor <= _maxScalingFactor(), "max scaling factor too low");

        // add balance
        _yamBalances[to] = _yamBalances[to].add(yamValue);

        // add delegates to the minter
        _moveDelegates(address(0), _delegates[to], yamValue);
        emit Mint(to, amount);
        emit Transfer(address(0), to, amount);
      }
    }

    /**
    * @notice Burns tokens from msg.sender, decreases totalSupply, initSupply, and a users balance.
    */

    function burn(uint256 amount)
        external
        returns (bool)
    {
        _burn(amount);
        return true;
    }

    function _burn(uint256 amount)
        internal
    {
                // decrease totalSupply
        totalSupply = totalSupply.sub(amount);

        // get underlying value
        uint256 yamValue = _fragmentToYam(amount);

        // decrease initSupply
        initSupply = initSupply.sub(yamValue);

        // decrease balance
        _yamBalances[msg.sender] = _yamBalances[msg.sender].sub(yamValue);

        // add delegates to the minter
        _moveDelegates(_delegates[msg.sender], address(0), yamValue);
        emit Burn(msg.sender, amount);
        emit Transfer(msg.sender, address(0), amount);
        }

    /**
    * @notice Mints new tokens using underlying amount, increasing totalSupply, initSupply, and a users balance.
    * @dev Limited to onlyMinter modifier
    */
    function mintUnderlying(address to, uint256 amount)
        external
        onlyMinter
        returns (bool)
    {
        _mintUnderlying(to, amount);
        return true;
    }

    function _mintUnderlying(address to, uint256 amount)
        internal
    {

        // increase initSupply
        initSupply = initSupply.add(amount);

        // get external value
        uint256 scaledAmount = _yamToFragment(amount);

        // increase totalSupply
        totalSupply = totalSupply.add(scaledAmount);

        // make sure the mint didnt push maxScalingFactor too low
        require(yamsScalingFactor <= _maxScalingFactor(), "max scaling factor too low");

        // add balance
        _yamBalances[to] = _yamBalances[to].add(amount);

        // add delegates to the minter
        _moveDelegates(address(0), _delegates[to], amount);
        emit Mint(to, scaledAmount);
        emit Transfer(address(0), to, scaledAmount);
   
    }

    /**
     * @dev Transfer underlying balance to a specified address.
     * @param to The address to transfer to.
     * @param value The amount to be transferred.
     * @return True on success, false otherwise.
     */
    function transferUnderlying(address to, uint256 value)
        external
        validRecipient(to)
        returns (bool)
    {
        // sub from balance of sender
        _yamBalances[msg.sender] = _yamBalances[msg.sender].sub(value);

        // add to balance of receiver
        _yamBalances[to] = _yamBalances[to].add(value);
        emit Transfer(msg.sender, to, _yamToFragment(value));

        _moveDelegates(_delegates[msg.sender], _delegates[to], value);
        return true;
    }
    
    /* - ERC20 functionality - */

    /**
    * @dev Transfer tokens to a specified address.
    * @param to The address to transfer to.
    * @param value The amount to be transferred.
    * @return True on success, false otherwise.
    */
    function transfer(address to, uint256 value)
        external
        validRecipient(to)
        returns (bool)
    {
        // underlying balance is stored in yams, so divide by current scaling factor

        // note, this means as scaling factor grows, dust will be untransferrable.
        // minimum transfer value == yamsScalingFactor / 1e24;

        // get amount in underlying
        uint256 yamValue = _fragmentToYam(value);

        // sub from balance of sender
        _yamBalances[msg.sender] = _yamBalances[msg.sender].sub(yamValue);

        // add to balance of receiver
        _yamBalances[to] = _yamBalances[to].add(yamValue);
        emit Transfer(msg.sender, to, value);

        _moveDelegates(_delegates[msg.sender], _delegates[to], yamValue);
        return true;
    }

    /**
    * @dev Transfer tokens from one address to another.
    * @param from The address you want to send tokens from.
    * @param to The address you want to transfer to.
    * @param value The amount of tokens to be transferred.
    */
    function transferFrom(address from, address to, uint256 value)
        external
        validRecipient(to)
        returns (bool)
    {
        // decrease allowance
        _allowedFragments[from][msg.sender] = _allowedFragments[from][msg.sender].sub(value);

        // get value in yams
        uint256 yamValue = _fragmentToYam(value);

        // sub from from
        _yamBalances[from] = _yamBalances[from].sub(yamValue);
        _yamBalances[to] = _yamBalances[to].add(yamValue);
        emit Transfer(from, to, value);

        _moveDelegates(_delegates[from], _delegates[to], yamValue);
        return true;
    }

    /**
    * @param who The address to query.
    * @return The balance of the specified address.
    */
    function balanceOf(address who)
      external
      view
      returns (uint256)
    {
      return _yamToFragment(_yamBalances[who]);
    }

    /** @notice Currently returns the internal storage amount
    * @param who The address to query.
    * @return The underlying balance of the specified address.
    */
    function balanceOfUnderlying(address who)
      external
      view
      returns (uint256)
    {
      return _yamBalances[who];
    }

    /**
     * @dev Function to check the amount of tokens that an owner has allowed to a spender.
     * @param owner_ The address which owns the funds.
     * @param spender The address which will spend the funds.
     * @return The number of tokens still available for the spender.
     */
    function allowance(address owner_, address spender)
        external
        view
        returns (uint256)
    {
        return _allowedFragments[owner_][spender];
    }

    /**
     * @dev Approve the passed address to spend the specified amount of tokens on behalf of
     * msg.sender. This method is included for ERC20 compatibility.
     * increaseAllowance and decreaseAllowance should be used instead.
     * Changing an allowance with this method brings the risk that someone may transfer both
     * the old and the new allowance - if they are both greater than zero - if a transfer
     * transaction is mined before the later approve() call is mined.
     *
     * @param spender The address which will spend the funds.
     * @param value The amount of tokens to be spent.
     */
    function approve(address spender, uint256 value)
        external
        returns (bool)
    {
        _allowedFragments[msg.sender][spender] = value;
        emit Approval(msg.sender, spender, value);
        return true;
    }

    /**
     * @dev Increase the amount of tokens that an owner has allowed to a spender.
     * This method should be used instead of approve() to avoid the double approval vulnerability
     * described above.
     * @param spender The address which will spend the funds.
     * @param addedValue The amount of tokens to increase the allowance by.
     */
    function increaseAllowance(address spender, uint256 addedValue)
        external
        returns (bool)
    {
        _allowedFragments[msg.sender][spender] =
            _allowedFragments[msg.sender][spender].add(addedValue);
        emit Approval(msg.sender, spender, _allowedFragments[msg.sender][spender]);
        return true;
    }

    /**
     * @dev Decrease the amount of tokens that an owner has allowed to a spender.
     *
     * @param spender The address which will spend the funds.
     * @param subtractedValue The amount of tokens to decrease the allowance by.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue)
        external
        returns (bool)
    {
        uint256 oldValue = _allowedFragments[msg.sender][spender];
        if (subtractedValue >= oldValue) {
            _allowedFragments[msg.sender][spender] = 0;
        } else {
            _allowedFragments[msg.sender][spender] = oldValue.sub(subtractedValue);
        }
        emit Approval(msg.sender, spender, _allowedFragments[msg.sender][spender]);
        return true;
    }

    // --- Approve by signature ---
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    )
        external
    {
        require(now <= deadline, "YAM/permit-expired");

        bytes32 digest =
            keccak256(
                abi.encodePacked(
                    "\x19\x01",
                    DOMAIN_SEPARATOR,
                    keccak256(
                        abi.encode(
                            PERMIT_TYPEHASH,
                            owner,
                            spender,
                            value,
                            nonces[owner]++,
                            deadline
                        )
                    )
                )
            );

        require(owner != address(0), "YAM/invalid-address-0");
        require(owner == ecrecover(digest, v, r, s), "YAM/invalid-permit");
        _allowedFragments[owner][spender] = value;
        emit Approval(owner, spender, value);
    }

    /* - Governance Functions - */

    /** @notice sets the rebaser
     * @param rebaser_ The address of the rebaser contract to use for authentication.
     */
    function _setRebaser(address rebaser_)
        external
        onlyGov
    {
        address oldRebaser = rebaser;
        rebaser = rebaser_;
        emit NewRebaser(oldRebaser, rebaser_);
    }

    /** @notice sets the migrator
     * @param migrator_ The address of the migrator contract to use for authentication.
     */
    function _setMigrator(address migrator_)
        external
        onlyGov
    {
        address oldMigrator = migrator_;
        migrator = migrator_;
        emit NewMigrator(oldMigrator, migrator_);
    }

    /** @notice sets the incentivizer
     * @param incentivizer_ The address of the rebaser contract to use for authentication.
     */
    function _setIncentivizer(address incentivizer_)
        external
        onlyGov
    {
        address oldIncentivizer = incentivizer;
        incentivizer = incentivizer_;
        emit NewIncentivizer(oldIncentivizer, incentivizer_);
    }

    /** @notice sets the pendingGov
     * @param pendingGov_ The address of the rebaser contract to use for authentication.
     */
    function _setPendingGov(address pendingGov_)
        external
        onlyGov
    {
        address oldPendingGov = pendingGov;
        pendingGov = pendingGov_;
        emit NewPendingGov(oldPendingGov, pendingGov_);
    }

    /** @notice allows governance to assign delegate to self
     *
     */
    function _acceptGov()
        external
    {
        require(msg.sender == pendingGov, "!pending");
        address oldGov = gov;
        gov = pendingGov;
        pendingGov = address(0);
        emit NewGov(oldGov, gov);
    }

    function assignSelfDelegate(address nonvotingContract)
        external
        onlyGov
    {
        address delegate = _delegates[nonvotingContract];
        require( delegate == address(0), "!address(0)" );
        // assigns delegate to self only
        _delegate(nonvotingContract, nonvotingContract);
    }

    /* - Extras - */

    /**
    * @notice Initiates a new rebase operation, provided the minimum time period has elapsed.
    *
    * @dev The supply adjustment equals (totalSupply * DeviationFromTargetRate) / rebaseLag
    *      Where DeviationFromTargetRate is (MarketOracleRate - targetRate) / targetRate
    *      and targetRate is CpiOracleRate / baseCpi
    */
    function rebase(
        uint256 epoch,
        uint256 indexDelta,
        bool positive
    )
        external
        onlyRebaser
        returns (uint256)
    {
        // no change
        if (indexDelta == 0) {
          emit Rebase(epoch, yamsScalingFactor, yamsScalingFactor);
          return totalSupply;
        }

        // for events
        uint256 prevYamsScalingFactor = yamsScalingFactor;


        if (!positive) {
            // negative rebase, decrease scaling factor
            yamsScalingFactor = yamsScalingFactor.mul(BASE.sub(indexDelta)).div(BASE);
        } else {
            // positive reabse, increase scaling factor
            uint256 newScalingFactor = yamsScalingFactor.mul(BASE.add(indexDelta)).div(BASE);
            if (newScalingFactor < _maxScalingFactor()) {
                yamsScalingFactor = newScalingFactor;
            } else {
                yamsScalingFactor = _maxScalingFactor();
            }
        }

        // update total supply, correctly
        totalSupply = _yamToFragment(initSupply);

        emit Rebase(epoch, prevYamsScalingFactor, yamsScalingFactor);
        return totalSupply;
    }

    function yamToFragment(uint256 yam)
        external
        view
        returns (uint256)
    {
        return _yamToFragment(yam);
    }

    function fragmentToYam(uint256 value)
        external
        view
        returns (uint256)
    {
        return _fragmentToYam(value);
    }

    function _yamToFragment(uint256 yam)
        internal
        view
        returns (uint256)
    {
        return yam.mul(yamsScalingFactor).div(internalDecimals);
    }

    function _fragmentToYam(uint256 value)
        internal
        view
        returns (uint256)
    {
        return value.mul(internalDecimals).div(yamsScalingFactor);
    }

    // Rescue tokens
    function rescueTokens(
        address token,
        address to,
        uint256 amount
    )
        external
        onlyGov
        returns (bool)
    {
        // transfer to
        SafeERC20_2.safeTransfer(IERC20_2(token), to, amount);
        return true;
    }
}

contract YAMLogic3 is YAMToken {
    /**
     * @notice Initialize the new money market
     * @param name_ ERC-20 name of this token
     * @param symbol_ ERC-20 symbol of this token
     * @param decimals_ ERC-20 decimal precision of this token
     */
    function initialize(
        string memory name_,
        string memory symbol_,
        uint8 decimals_,
        address initial_owner,
        uint256 initTotalSupply_
    )
        public
    {
        super.initialize(name_, symbol_, decimals_);

        yamsScalingFactor = BASE;
        initSupply = _fragmentToYam(initTotalSupply_);
        totalSupply = initTotalSupply_;
        _yamBalances[initial_owner] = initSupply;

        DOMAIN_SEPARATOR = keccak256(
            abi.encode(
                DOMAIN_TYPEHASH,
                keccak256(bytes(name)),
                getChainId(),
                address(this)
            )
        );
    }
}

////// lib/yamV3/contracts/token/YAMDelegate3.sol
/* pragma solidity 0.5.15; */

/* Copyright 2020 Compound Labs, Inc.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.

2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.

3. Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */


/* import "./YAMLogic3.sol"; */

contract YAMDelegationStorage {
    /**
     * @notice Implementation address for this contract
     */
    address public implementation;
}

contract YAMDelegatorInterface is YAMDelegationStorage {
    /**
     * @notice Emitted when implementation is changed
     */
    event NewImplementation(address oldImplementation, address newImplementation);

    /**
     * @notice Called by the gov to update the implementation of the delegator
     * @param implementation_ The address of the new implementation for delegation
     * @param allowResign Flag to indicate whether to call _resignImplementation on the old implementation
     * @param becomeImplementationData The encoded bytes data to be passed to _becomeImplementation
     */
    function _setImplementation(address implementation_, bool allowResign, bytes memory becomeImplementationData) public;
}

contract YAMDelegateInterface is YAMDelegationStorage {
    /**
     * @notice Called by the delegator on a delegate to initialize it for duty
     * @dev Should revert if any issues arise which make it unfit for delegation
     * @param data The encoded bytes data for any initialization
     */
    function _becomeImplementation(bytes memory data) public;

    /**
     * @notice Called by the delegator on a delegate to forfeit its responsibility
     */
    function _resignImplementation() public;
}


contract YAMDelegate3 is YAMLogic3, YAMDelegateInterface {
    /**
     * @notice Construct an empty delegate
     */
    constructor() public {}

    /**
     * @notice Called by the delegator on a delegate to initialize it for duty
     * @param data The encoded bytes data for any initialization
     */
    function _becomeImplementation(bytes memory data) public {
        // Shh -- currently unused
        data;

        // Shh -- we don't ever want this hook to be marked pure
        if (false) {
            implementation = address(0);
        }

        require(msg.sender == gov, "only the gov may call _becomeImplementation");
    }

    /**
     * @notice Called by the delegator on a delegate to forfeit its responsibility
     */
    function _resignImplementation() public {
        // Shh -- we don't ever want this hook to be marked pure
        if (false) {
            implementation = address(0);
        }

        require(msg.sender == gov, "only the gov may call _resignImplementation");
    }
}

////// lib/yamV3/contracts/tests/vesting_pool/VestingPool.sol
/* pragma solidity 0.5.15; */

/* import "../../lib/SafeERC20.sol"; */
/* import {YAMDelegate3} from "../../token/YAMDelegate3.sol"; */

contract VestingPool {
    using SafeMath_2 for uint256;
    using SafeMath_2 for uint128;

    struct Stream {
        address recipient;
        uint128 startTime;
        uint128 length;
        uint256 totalAmount;
        uint256 amountPaidOut;
    }

    /**
     * @notice Governor for this contract
     */
    address public gov;

    /**
     * @notice Pending governance for this contract
     */
    address public pendingGov;

    /// @notice Mapping containing valid stream managers
    mapping(address => bool) public isSubGov;

    /// @notice Amount of tokens allocated to streams that hasn't yet been claimed
    uint256 public totalUnclaimedInStreams;

    /// @notice The number of streams created so far
    uint256 public streamCount;

    /// @notice All streams
    mapping(uint256 => Stream) public streams;

    /// @notice YAM token
    YAMDelegate3 public yam;

    /**
     * @notice Event emitted when a sub gov is enabled/disabled
     */
    event SubGovModified(
        address account, 
        bool isSubGov
    );

    /**
     * @notice Event emitted when stream is opened
     */
    event StreamOpened(
        address indexed account,
        uint256 indexed streamId,
        uint256 length,
        uint256 totalAmount
    );

    /**
     * @notice Event emitted when stream is closed
     */
    event StreamClosed(uint256 indexed streamId);

    /**
     * @notice Event emitted on payout
     */
    event Payout(
        uint256 indexed streamId,
        address indexed recipient,
        uint256 amount
    );

    /**
     * @notice Event emitted when pendingGov is changed
     */
    event NewPendingGov(
        address oldPendingGov, 
        address newPendingGov
    );

    /**
     * @notice Event emitted when gov is changed
     */
    event NewGov(
        address oldGov, 
        address newGov
    );

    constructor(YAMDelegate3 _yam)
        public
    {
        gov = msg.sender;
        yam = _yam;
    }

    modifier onlyGov() {
        require(msg.sender == gov, "VestingPool::onlyGov: account is not gov");
        _;
    }

    modifier canManageStreams() {
        require(
            isSubGov[msg.sender] || (msg.sender == gov),
            "VestingPool::canManageStreams: account cannot manage streams"
        );
        _;
    }

    /**
     * @dev Set whether an account can open/close streams. Only callable by the current gov contract
     * @param account The account to set permissions for.
     * @param _isSubGov Whether or not this account can manage streams
     */
    function setSubGov(address account, bool _isSubGov)
        public
        onlyGov
    {
        isSubGov[account] = _isSubGov;
        emit SubGovModified(account, _isSubGov);
    }

    /** @notice sets the pendingGov
     * @param pendingGov_ The address of the contract to use for authentication.
     */
    function _setPendingGov(address pendingGov_)
        external
        onlyGov
    {
        address oldPendingGov = pendingGov;
        pendingGov = pendingGov_;
        emit NewPendingGov(oldPendingGov, pendingGov_);
    }

    /** @notice accepts governance over this contract
     *
     */
    function _acceptGov()
        external
    {
        require(msg.sender == pendingGov, "!pending");
        address oldGov = gov;
        gov = pendingGov;
        pendingGov = address(0);
        emit NewGov(oldGov, gov);
    }

    /**
     * @dev Opens a new stream that continuously pays out.
     * @param recipient Account that will receive the funds.
     * @param length The amount of time in seconds that the stream lasts
     * @param totalAmount The total amount to payout in the stream
     */
    function openStream(
        address recipient,
        uint128 length,
        uint256 totalAmount
    )
        public
        canManageStreams
        returns (uint256 streamIndex)
    {
        streamIndex = streamCount++;
        streams[streamIndex] = Stream({
            recipient: recipient,
            length: length,
            startTime: uint128(block.timestamp),
            totalAmount: totalAmount,
            amountPaidOut: 0
        });
        totalUnclaimedInStreams = totalUnclaimedInStreams.add(totalAmount);
        require(
            totalUnclaimedInStreams <= yam.balanceOfUnderlying(address(this)),
            "VestingPool::payout: Total streaming is greater than pool's YAM balance"
        );
        emit StreamOpened(recipient, streamIndex, length, totalAmount);
    }

    /**
     * @dev Closes the specified stream. Pays out pending amounts, clears out the stream, and emits a StreamClosed event.
     * @param streamId The id of the stream to close.
     */
    function closeStream(uint256 streamId)
        public
        canManageStreams
    {
        payout(streamId);
        streams[streamId] = Stream(
            address(0x0000000000000000000000000000000000000000),
            0,
            0,
            0,
            0
        );
        emit StreamClosed(streamId);
    }

    /**
     * @dev Pays out pending amount in a stream
     * @param streamId The id of the stream to payout.
     * @return The amount paid out in underlying
     */
    function payout(uint256 streamId)
        public
        returns (uint256 paidOut)
    {
        uint128 currentTime = uint128(block.timestamp);
        Stream memory stream = streams[streamId];
        require(
            stream.startTime <= currentTime,
            "VestingPool::payout: Stream hasn't started yet"
        );
        uint256 claimableUnderlying = _claimable(stream);
        streams[streamId].amountPaidOut = stream.amountPaidOut.add(
            claimableUnderlying
        );

        totalUnclaimedInStreams = totalUnclaimedInStreams.sub(
            claimableUnderlying
        );

        yam.transferUnderlying(stream.recipient, claimableUnderlying);

        emit Payout(streamId, stream.recipient, claimableUnderlying);
        return claimableUnderlying;
    }


    /**
     * @dev The amount that is claimable for a stream
     * @param streamId The stream to get the claimabout amount for.
     * @return The amount that is claimable for this stream
     */
    function claimable(uint256 streamId)
        external
        view
        returns (uint256 claimableUnderlying)
    {
        Stream memory stream = streams[streamId];
        return _claimable(stream);
    }

    function _claimable(Stream memory stream)
        internal
        view
        returns (uint256 claimableUnderlying)
    {
        uint128 currentTime = uint128(block.timestamp);
        uint128 elapsedTime = currentTime - stream.startTime;
        if (currentTime >= stream.startTime + stream.length) {
            claimableUnderlying = stream.totalAmount - stream.amountPaidOut;
        } else {
            claimableUnderlying = elapsedTime
                .mul(stream.totalAmount)
                .div(stream.length)
                .sub(stream.amountPaidOut);
        }
    }

}

////// ./contracts/2021/12/Proposal21.sol
/* pragma solidity 0.5.15; */
/* pragma experimental ABIEncoderV2; */

/* import {VestingPool} from "yamV3/tests/vesting_pool/VestingPool.sol"; */
/* import {YAMTokenInterface} from "yamV3/token/YAMTokenInterface.sol"; */
/* import {Timelock} from "yamV3/governance/TimeLock.sol"; */
/* import {IERC20} from "yamV3/lib/IERC20.sol"; */

interface YVault_2 {
    function deposit(uint256 amount, address recipient)
        external
        returns (uint256);

    function withdraw(uint256 amount) external returns (uint256);
}

contract Proposal21 {
    // @dev Contracts and ERC20 addresses
    IERC20_2 internal constant USDC =
        IERC20_2(0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48);
    YVault_2 internal constant yUSDC =
        YVault_2(0x5f18C75AbDAe578b483E5F43f12a39cF75b973a9);
    VestingPool internal constant pool =
        VestingPool(0xDCf613db29E4d0B35e7e15e93BF6cc6315eB0b82);
    address internal constant RESERVES =
        0x97990B693835da58A281636296D2Bf02787DEa17;

    function execute() public {
        IERC20_2(address(yUSDC)).transferFrom(
            RESERVES,
            address(this),
            IERC20_2(address(yUSDC)).balanceOf(RESERVES)
        );
        yUSDC.withdraw(uint256(-1));

        // Stablecoin transfers

        // Chilly
        USDC.transfer(
            0x01e0C7b70E0E05a06c7cC8deeb97Fa03d6a77c9C,
            yearlyToMonthlyUSD(93800, 1)
        );

        // Krguman
        USDC.transfer(
            0xcc506b3c2967022094C3B00276617883167BF32B,
            yearlyToMonthlyUSD(28000, 1)
        );

        // Designer
        USDC.transfer(
            0x3FdcED6B5C1f176b543E5E0b841cB7224596C33C,
            yearlyToMonthlyUSD(92400, 1)
        );

        // Ross
        USDC.transfer(
            0x88c868B1024ECAefDc648eb152e91C57DeA984d0,
            yearlyToMonthlyUSD(84000, 1)
        );

        // Blokku
        USDC.transfer(
            0x392027fDc620d397cA27F0c1C3dCB592F27A4dc3,
            yearlyToMonthlyUSD(22500, 1)
        );

        // Kris
        USDC.transfer(
            0x386568164bdC5B105a66D8Ae83785D4758939eE6,
            yearlyToMonthlyUSD(15000, 1)
        );

        // Will
        USDC.transfer(
            0x31920DF2b31B5f7ecf65BDb2c497DE31d299d472,
            yearlyToMonthlyUSD(84000, 1)
        );

        // Snake
        USDC.transfer(
            0xce1559448e21981911fAC70D4eC0C02cA1EFF39C,
            yearlyToMonthlyUSD(28800, 1)
        );

        uint256 usdcBalance = USDC.balanceOf(address(this));
        USDC.approve(address(yUSDC), usdcBalance);
        yUSDC.deposit(usdcBalance, RESERVES);

        // Streams

        // Update E stream
        pool.closeStream(78);
        pool.openStream(
            0x8A8acf1cEcC4ed6Fe9c408449164CE2034AdC03f,
            90 days,
            13492 * (10**24) * 3
        );

        // Update Chilly stream
        pool.closeStream(79);
        pool.openStream(
            0x01e0C7b70E0E05a06c7cC8deeb97Fa03d6a77c9C,
            90 days,
            3190 * (10**24) * 3
        );

        // Update Krugman stream
        pool.closeStream(80);
        pool.openStream(
            0xcc506b3c2967022094C3B00276617883167BF32B,
            90 days,
            952 * (10**24) * 3
        );

        // Update Designer stream
        pool.closeStream(68);
        pool.openStream(
            0x3FdcED6B5C1f176b543E5E0b841cB7224596C33C,
            90 days,
            3143 * (10**24) * 3
        );

        // Update Ross stream
        pool.closeStream(69);
        pool.openStream(
            0x88c868B1024ECAefDc648eb152e91C57DeA984d0,
            90 days,
            2381 * (10**24) * 3
        );

        // Update Byterose stream
        pool.closeStream(82);
        pool.openStream(
            0xbe9Bb7a473DE5c043146B24AbfA72AB81aee67CD,
            90 days,
            9524 * (10**24) * 3
        );

        // Update Blokku stream
        pool.closeStream(70);
        pool.openStream(
            0x392027fDc620d397cA27F0c1C3dCB592F27A4dc3,
            90 days,
            2381 * (10**24) * 3
        );

        // Update Kris stream
        pool.closeStream(71);
        pool.openStream(
            0x386568164bdC5B105a66D8Ae83785D4758939eE6,
            90 days,
            1190 * (10**24) * 3
        );

        // Update Will stream
        pool.closeStream(73);
        pool.openStream(
            0x31920DF2b31B5f7ecf65BDb2c497DE31d299d472,
            90 days,
            2857 * (10**24) * 3
        );

        // Update Snake stream
        pool.closeStream(74);
        pool.openStream(
            0xce1559448e21981911fAC70D4eC0C02cA1EFF39C,
            90 days,
            5714 * (10**24) * 3
        );

        // Update Mona stream
        pool.closeStream(81);
        pool.openStream(
            0xdADc6F71986643d9e9CB368f08Eb6F1333F6d8f9,
            90 days,
            1587 * (10**24) * 3
        );

        // Streams previous pay

        // E stream previous pay
        pool.payout(
            pool.openStream(
                0x8A8acf1cEcC4ed6Fe9c408449164CE2034AdC03f,
                0 days,
                4121 * (10**24)
            )
        );

        // Chilly stream previous pay
        pool.payout(
            pool.openStream(
                0x01e0C7b70E0E05a06c7cC8deeb97Fa03d6a77c9C,
                0 days,
                975 * (10**24)
            )
        );

        // Krugman stream previous pay
        pool.payout(
            pool.openStream(
                0xcc506b3c2967022094C3B00276617883167BF32B,
                0 days,
                291 * (10**24)
            )
        );

        // Mona stream previous pay
        pool.payout(
            pool.openStream(
                0xdADc6F71986643d9e9CB368f08Eb6F1333F6d8f9,
                0 days,
                485 * (10**24)
            )
        );

        // Byterose stream previous pay
        pool.payout(
            pool.openStream(
                0xbe9Bb7a473DE5c043146B24AbfA72AB81aee67CD,
                0 days,
                3879 * (10**24)
            )
        );
    }

    function yearlyToMonthlyUSD(uint256 yearlyUSD, uint256 months)
        internal
        pure
        returns (uint256)
    {
        return (((yearlyUSD * (10**6)) / uint256(12)) * months);
    }
}