// File: @openzeppelin/contracts/math/Math.sol

pragma solidity ^0.5.0;

/**
 * @dev Standard math utilities missing in the Solidity language.
 */
library Math {
    /**
     * @dev Returns the largest of two numbers.
     */
    function max(uint256 a, uint256 b) internal pure returns (uint256) {
        return a >= b ? a : b;
    }

    /**
     * @dev Returns the smallest of two numbers.
     */
    function min(uint256 a, uint256 b) internal pure returns (uint256) {
        return a < b ? a : b;
    }

    /**
     * @dev Returns the average of two numbers. The result is rounded towards
     * zero.
     */
    function average(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b) / 2 can overflow, so we distribute
        return (a / 2) + (b / 2) + ((a % 2 + b % 2) / 2);
    }
}

// File: @openzeppelin/contracts/math/SafeMath.sol

pragma solidity ^0.5.0;

/**
 * @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 {
    /**
     * @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.
     *
     * _Available since v2.4.0._
     */
    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.
     *
     * _Available since v2.4.0._
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        // Solidity only automatically asserts when dividing by 0
        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.
     *
     * _Available since v2.4.0._
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

// File: @openzeppelin/contracts/token/ERC20/IERC20.sol

pragma solidity ^0.5.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP. Does not include
 * the optional functions; to access them see {ERC20Detailed}.
 */
interface IERC20 {
    /**
     * @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);
}

// File: @openzeppelin/contracts/token/ERC20/ERC20Detailed.sol

pragma solidity ^0.5.0;


/**
 * @dev Optional functions from the ERC20 standard.
 */
contract ERC20Detailed is IERC20 {
    string private _name;
    string private _symbol;
    uint8 private _decimals;

    /**
     * @dev Sets the values for `name`, `symbol`, and `decimals`. All three of
     * these values are immutable: they can only be set once during
     * construction.
     */
    constructor (string memory name, string memory symbol, uint8 decimals) public {
        _name = name;
        _symbol = symbol;
        _decimals = decimals;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5,05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei.
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view returns (uint8) {
        return _decimals;
    }
}

// File: @openzeppelin/contracts/utils/Address.sol

pragma solidity ^0.5.5;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @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) {
        // According to EIP-1052, 0x0 is the value returned for not-yet created accounts
        // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned
        // for accounts without code, i.e. `keccak256('')`
        bytes32 codehash;
        bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
        // solhint-disable-next-line no-inline-assembly
        assembly { codehash := extcodehash(account) }
        return (codehash != accountHash && codehash != 0x0);
    }

    /**
     * @dev Converts an `address` into `address payable`. Note that this is
     * simply a type cast: the actual underlying value is not changed.
     *
     * _Available since v2.4.0._
     */
    function toPayable(address account) internal pure returns (address payable) {
        return address(uint160(account));
    }

    /**
     * @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].
     *
     * _Available since v2.4.0._
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        // solhint-disable-next-line avoid-call-value
        (bool success, ) = recipient.call.value(amount)("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }
}

// File: @openzeppelin/contracts/token/ERC20/SafeERC20.sol

pragma solidity ^0.5.0;




/**
 * @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 ERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using SafeMath for uint256;
    using Address for address;

    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    function safeApprove(IERC20 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 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 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 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.

        // A Solidity high level call has three parts:
        //  1. The target address is checked to verify it contains contract code
        //  2. The call itself is made, and success asserted
        //  3. The return value is decoded, which in turn checks the size of the returned data.
        // solhint-disable-next-line max-line-length
        require(address(token).isContract(), "SafeERC20: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = address(token).call(data);
        require(success, "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");
        }
    }
}

// File: @openzeppelin/contracts/GSN/Context.sol

pragma solidity ^0.5.0;

/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with GSN meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
contract Context {
    // Empty internal constructor, to prevent people from mistakenly deploying
    // an instance of this contract, which should be used via inheritance.
    constructor () internal { }
    // solhint-disable-previous-line no-empty-blocks

    function _msgSender() internal view returns (address payable) {
        return msg.sender;
    }

    function _msgData() internal view returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

// File: @openzeppelin/contracts/ownership/Ownable.sol

pragma solidity ^0.5.0;

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor () internal {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(isOwner(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Returns true if the caller is the current owner.
     */
    function isOwner() public view returns (bool) {
        return _msgSender() == _owner;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public onlyOwner {
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     */
    function _transferOwnership(address newOwner) internal {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

// File: @openzeppelin/contracts/utils/ReentrancyGuard.sol

pragma solidity ^0.5.0;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 *
 * _Since v2.5.0:_ this module is now much more gas efficient, given net gas
 * metering changes introduced in the Istanbul hardfork.
 */
contract ReentrancyGuard {
    bool private _notEntered;

    constructor () internal {
        // Storing an initial non-zero value makes deployment a bit more
        // expensive, but in exchange the refund on every call to nonReentrant
        // will be lower in amount. Since refunds are capped to a percetange of
        // the total transaction's gas, it is best to keep them low in cases
        // like this one, to increase the likelihood of the full refund coming
        // into effect.
        _notEntered = true;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and make it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_notEntered, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _notEntered = false;

        _;

        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _notEntered = true;
    }
}

// File: contracts/compound/ComptrollerInterface.sol

pragma solidity ^0.5.16;

contract ComptrollerInterface {
    // implemented, but missing from the interface
    function getAccountLiquidity(address account) external view returns (uint, uint, uint);
    function getHypotheticalAccountLiquidity(
        address account,
        address cTokenModify,
        uint redeemTokens,
        uint borrowAmount) external view returns (uint, uint, uint);
    function claimComp(address holder) external;

    /// @notice Indicator that this is a Comptroller contract (for inspection)
    bool public constant isComptroller = true;

    /*** Assets You Are In ***/

    function enterMarkets(address[] calldata cTokens) external returns (uint[] memory);
    function exitMarket(address cToken) external returns (uint);

    /*** Policy Hooks ***/

    function mintAllowed(address cToken, address minter, uint mintAmount) external returns (uint);
    function mintVerify(address cToken, address minter, uint mintAmount, uint mintTokens) external;

    function redeemAllowed(address cToken, address redeemer, uint redeemTokens) external returns (uint);
    function redeemVerify(address cToken, address redeemer, uint redeemAmount, uint redeemTokens) external;

    function borrowAllowed(address cToken, address borrower, uint borrowAmount) external returns (uint);
    function borrowVerify(address cToken, address borrower, uint borrowAmount) external;

    function repayBorrowAllowed(
        address cToken,
        address payer,
        address borrower,
        uint repayAmount) external returns (uint);
    function repayBorrowVerify(
        address cToken,
        address payer,
        address borrower,
        uint repayAmount,
        uint borrowerIndex) external;

    function liquidateBorrowAllowed(
        address cTokenBorrowed,
        address cTokenCollateral,
        address liquidator,
        address borrower,
        uint repayAmount) external returns (uint);
    function liquidateBorrowVerify(
        address cTokenBorrowed,
        address cTokenCollateral,
        address liquidator,
        address borrower,
        uint repayAmount,
        uint seizeTokens) external;

    function seizeAllowed(
        address cTokenCollateral,
        address cTokenBorrowed,
        address liquidator,
        address borrower,
        uint seizeTokens) external returns (uint);
    function seizeVerify(
        address cTokenCollateral,
        address cTokenBorrowed,
        address liquidator,
        address borrower,
        uint seizeTokens) external;

    function transferAllowed(address cToken, address src, address dst, uint transferTokens) external returns (uint);
    function transferVerify(address cToken, address src, address dst, uint transferTokens) external;

    /*** Liquidity/Liquidation Calculations ***/

    function liquidateCalculateSeizeTokens(
        address cTokenBorrowed,
        address cTokenCollateral,
        uint repayAmount) external view returns (uint, uint);

    function markets(address cToken) external view returns (bool, uint);
    function compSpeeds(address cToken) external view returns (uint);
}

// File: contracts/compound/InterestRateModel.sol

pragma solidity ^0.5.16;

/**
  * @title Compound's InterestRateModel Interface
  * @author Compound
  */
contract InterestRateModel {
    /// @notice Indicator that this is an InterestRateModel contract (for inspection)
    bool public constant isInterestRateModel = true;

    /**
      * @notice Calculates the current borrow interest rate per block
      * @param cash The total amount of cash the market has
      * @param borrows The total amount of borrows the market has outstanding
      * @param reserves The total amnount of reserves the market has
      * @return The borrow rate per block (as a percentage, and scaled by 1e18)
      */
    function getBorrowRate(uint cash, uint borrows, uint reserves) external view returns (uint);

    /**
      * @notice Calculates the current supply interest rate per block
      * @param cash The total amount of cash the market has
      * @param borrows The total amount of borrows the market has outstanding
      * @param reserves The total amnount of reserves the market has
      * @param reserveFactorMantissa The current reserve factor the market has
      * @return The supply rate per block (as a percentage, and scaled by 1e18)
      */
    function getSupplyRate(uint cash, uint borrows, uint reserves, uint reserveFactorMantissa) external view returns (uint);

}

// File: contracts/compound/CTokenInterfaces.sol

pragma solidity ^0.5.16;



contract CTokenStorage {
    /**
     * @dev Guard variable for re-entrancy checks
     */
    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 Maximum borrow rate that can ever be applied (.0005% / block)
     */

    uint internal constant borrowRateMaxMantissa = 0.0005e16;

    /**
     * @notice Maximum fraction of interest that can be set aside for reserves
     */
    uint internal constant reserveFactorMaxMantissa = 1e18;

    /**
     * @notice Administrator for this contract
     */
    address payable public admin;

    /**
     * @notice Pending administrator for this contract
     */
    address payable public pendingAdmin;

    /**
     * @notice Contract which oversees inter-cToken operations
     */
    ComptrollerInterface public comptroller;

    /**
     * @notice Model which tells what the current interest rate should be
     */
    InterestRateModel public interestRateModel;

    /**
     * @notice Initial exchange rate used when minting the first CTokens (used when totalSupply = 0)
     */
    uint internal initialExchangeRateMantissa;

    /**
     * @notice Fraction of interest currently set aside for reserves
     */
    uint public reserveFactorMantissa;

    /**
     * @notice Block number that interest was last accrued at
     */
    uint public accrualBlockNumber;

    /**
     * @notice Accumulator of the total earned interest rate since the opening of the market
     */
    uint public borrowIndex;

    /**
     * @notice Total amount of outstanding borrows of the underlying in this market
     */
    uint public totalBorrows;

    /**
     * @notice Total amount of reserves of the underlying held in this market
     */
    uint public totalReserves;

    /**
     * @notice Total number of tokens in circulation
     */
    uint public totalSupply;

    /**
     * @notice Official record of token balances for each account
     */
    mapping (address => uint) internal accountTokens;

    /**
     * @notice Approved token transfer amounts on behalf of others
     */
    mapping (address => mapping (address => uint)) internal transferAllowances;

    /**
     * @notice Container for borrow balance information
     * @member principal Total balance (with accrued interest), after applying the most recent balance-changing action
     * @member interestIndex Global borrowIndex as of the most recent balance-changing action
     */
    struct BorrowSnapshot {
        uint principal;
        uint interestIndex;
    }

    /**
     * @notice Mapping of account addresses to outstanding borrow balances
     */
    mapping(address => BorrowSnapshot) internal accountBorrows;
}

contract CTokenInterface is CTokenStorage {
    /**
     * @notice Indicator that this is a CToken contract (for inspection)
     */
    bool public constant isCToken = true;


    /*** Market Events ***/

    /**
     * @notice Event emitted when interest is accrued
     */
    event AccrueInterest(uint cashPrior, uint interestAccumulated, uint borrowIndex, uint totalBorrows);

    /**
     * @notice Event emitted when tokens are minted
     */
    event Mint(address minter, uint mintAmount, uint mintTokens);

    /**
     * @notice Event emitted when tokens are redeemed
     */
    event Redeem(address redeemer, uint redeemAmount, uint redeemTokens);

    /**
     * @notice Event emitted when underlying is borrowed
     */
    event Borrow(address borrower, uint borrowAmount, uint accountBorrows, uint totalBorrows);

    /**
     * @notice Event emitted when a borrow is repaid
     */
    event RepayBorrow(address payer, address borrower, uint repayAmount, uint accountBorrows, uint totalBorrows);

    /**
     * @notice Event emitted when a borrow is liquidated
     */
    event LiquidateBorrow(address liquidator, address borrower, uint repayAmount, address cTokenCollateral, uint seizeTokens);


    /*** Admin Events ***/

    /**
     * @notice Event emitted when pendingAdmin is changed
     */
    event NewPendingAdmin(address oldPendingAdmin, address newPendingAdmin);

    /**
     * @notice Event emitted when pendingAdmin is accepted, which means admin is updated
     */
    event NewAdmin(address oldAdmin, address newAdmin);

    /**
     * @notice Event emitted when comptroller is changed
     */
    event NewComptroller(ComptrollerInterface oldComptroller, ComptrollerInterface newComptroller);

    /**
     * @notice Event emitted when interestRateModel is changed
     */
    event NewMarketInterestRateModel(InterestRateModel oldInterestRateModel, InterestRateModel newInterestRateModel);

    /**
     * @notice Event emitted when the reserve factor is changed
     */
    event NewReserveFactor(uint oldReserveFactorMantissa, uint newReserveFactorMantissa);

    /**
     * @notice Event emitted when the reserves are added
     */
    event ReservesAdded(address benefactor, uint addAmount, uint newTotalReserves);

    /**
     * @notice Event emitted when the reserves are reduced
     */
    event ReservesReduced(address admin, uint reduceAmount, uint newTotalReserves);

    /**
     * @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);

    /**
     * @notice Failure event
     */
    event Failure(uint error, uint info, uint detail);


    /*** User Interface ***/

    function transfer(address dst, uint amount) external returns (bool);
    function transferFrom(address src, address dst, uint amount) external returns (bool);
    function approve(address spender, uint amount) external returns (bool);
    function allowance(address owner, address spender) external view returns (uint);
    function balanceOf(address owner) external view returns (uint);
    function balanceOfUnderlying(address owner) external returns (uint);
    function getAccountSnapshot(address account) external view returns (uint, uint, uint, uint);
    function borrowRatePerBlock() external view returns (uint);
    function supplyRatePerBlock() external view returns (uint);
    function totalBorrowsCurrent() external returns (uint);
    function borrowBalanceCurrent(address account) external returns (uint);
    function borrowBalanceStored(address account) public view returns (uint);
    function exchangeRateCurrent() public returns (uint);
    function exchangeRateStored() public view returns (uint);
    function getCash() external view returns (uint);
    function accrueInterest() public returns (uint);
    function seize(address liquidator, address borrower, uint seizeTokens) external returns (uint);


    /*** Admin Functions ***/

    function _setPendingAdmin(address payable newPendingAdmin) external returns (uint);
    function _acceptAdmin() external returns (uint);
    function _setComptroller(ComptrollerInterface newComptroller) public returns (uint);
    function _setReserveFactor(uint newReserveFactorMantissa) external returns (uint);
    function _reduceReserves(uint reduceAmount) external returns (uint);
    function _setInterestRateModel(InterestRateModel newInterestRateModel) public returns (uint);
}

contract CErc20Storage {
    /**
     * @notice Underlying asset for this CToken
     */
    address public underlying;
}

contract CErc20Interface is CErc20Storage {

    /*** User Interface ***/

    function mint(uint mintAmount) external returns (uint);
    function redeem(uint redeemTokens) external returns (uint);
    function redeemUnderlying(uint redeemAmount) external returns (uint);
    function borrow(uint borrowAmount) external returns (uint);
    function repayBorrow(uint repayAmount) external returns (uint);
    function repayBorrowBehalf(address borrower, uint repayAmount) external returns (uint);
    function liquidateBorrow(address borrower, uint repayAmount, CTokenInterface cTokenCollateral) external returns (uint);


    /*** Admin Functions ***/

    function _addReserves(uint addAmount) external returns (uint);
}

contract CDelegationStorage {
    /**
     * @notice Implementation address for this contract
     */
    address public implementation;
}

contract CDelegatorInterface is CDelegationStorage {
    /**
     * @notice Emitted when implementation is changed
     */
    event NewImplementation(address oldImplementation, address newImplementation);

    /**
     * @notice Called by the admin 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 CDelegateInterface is CDelegationStorage {
    /**
     * @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;
}

// File: contracts/strategies/compound/CompleteCToken.sol

pragma solidity 0.5.16;



contract CompleteCToken is CErc20Interface, CTokenInterface {}

// File: contracts/hardworkInterface/IStrategy.sol

pragma solidity 0.5.16;

interface IStrategy {
    
    function unsalvagableTokens(address tokens) external view returns (bool);
    
    function governance() external view returns (address);
    function controller() external view returns (address);
    function underlying() external view returns (address);
    function vault() external view returns (address);

    function withdrawAllToVault() external;
    function withdrawToVault(uint256 amount) external;

    function investedUnderlyingBalance() external view returns (uint256); // itsNotMuch()

    // should only be called by controller
    function salvage(address recipient, address token, uint256 amount) external;

    function doHardWork() external;
    function depositArbCheck() external view returns(bool);
}

// File: contracts/weth/WETH9.sol

// based on https://etherscan.io/address/0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2#code

/**
 *Submitted for verification at Etherscan.io on 2017-12-12
*/

// Copyright (C) 2015, 2016, 2017 Dapphub

// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

pragma solidity 0.5.16;

contract WETH9 {

    function balanceOf(address target) public view returns (uint256); 

    function deposit() public payable ;
    function withdraw(uint wad) public ;
    function totalSupply() public view returns (uint) ;
    function approve(address guy, uint wad) public returns (bool) ;
    function transfer(address dst, uint wad) public returns (bool) ;
    function transferFrom(address src, address dst, uint wad) public returns (bool);

}


/*
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  Nothing in this License shall be construed as excluding or limiting
any implied license or other defenses to infringement that may
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  12. No Surrender of Others' Freedom.

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                     END OF TERMS AND CONDITIONS

            How to Apply These Terms to Your New Programs

  If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these terms.

  To do so, attach the following notices to the program.  It is safest
to attach them to the start of each source file to most effectively
state the exclusion of warranty; and each file should have at least
the "copyright" line and a pointer to where the full notice is found.

    <one line to give the program's name and a brief idea of what it does.>
    Copyright (C) <year>  <name of author>

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.

Also add information on how to contact you by electronic and paper mail.

  If the program does terminal interaction, make it output a short
notice like this when it starts in an interactive mode:

    <program>  Copyright (C) <year>  <name of author>
    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
    This is free software, and you are welcome to redistribute it
    under certain conditions; type `show c' for details.

The hypothetical commands `show w' and `show c' should show the appropriate
parts of the General Public License.  Of course, your program's commands
might be different; for a GUI interface, you would use an "about box".

  You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU GPL, see
<http://www.gnu.org/licenses/>.

  The GNU General Public License does not permit incorporating your program
into proprietary programs.  If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library.  If this is what you want to do, use the GNU Lesser General
Public License instead of this License.  But first, please read
<http://www.gnu.org/philosophy/why-not-lgpl.html>.

*/

// File: @studydefi/money-legos/compound/contracts/ICEther.sol

pragma solidity ^0.5.0;

contract ICEther {
    function mint() external payable;
    function borrow(uint borrowAmount) external returns (uint);
    function redeem(uint redeemTokens) external returns (uint);
    function redeemUnderlying(uint redeemAmount) external returns (uint);
    function repayBorrow() external payable;
    function repayBorrowBehalf(address borrower) external payable;
    function borrowBalanceCurrent(address account) external returns (uint);
    function borrowBalanceStored(address account) external view returns (uint256);
    function balanceOfUnderlying(address account) external returns (uint);
    function balanceOf(address owner) external view returns (uint256);
    function getAccountSnapshot(address account) external view returns (uint, uint, uint, uint);
}

// File: contracts/strategies/compound/CompoundInteractor.sol

pragma solidity 0.5.16;











contract CompoundInteractor is ReentrancyGuard {

  using SafeMath for uint256;
  using SafeERC20 for IERC20;

  IERC20 public underlying;
  IERC20 public _weth = IERC20(0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2);
  CompleteCToken public ctoken;
  ComptrollerInterface public comptroller;

  constructor(
    address _underlying,
    address _ctoken,
    address _comptroller
  ) public {
    // Comptroller:
    comptroller = ComptrollerInterface(_comptroller);

    underlying = IERC20(_underlying);
    ctoken = CompleteCToken(_ctoken);

    // Enter the market
    address[] memory cTokens = new address[](1);
    cTokens[0] = _ctoken;
    comptroller.enterMarkets(cTokens);
  }

  /**
  * Supplies Ether to Compound
  * Unwraps WETH to Ether, then invoke the special mint for cEther
  * We ask to supply "amount", if the "amount" we asked to supply is
  * more than balance (what we really have), then only supply balance.
  * If we the "amount" we want to supply is less than balance, then
  * only supply that amount.
  */
  function _supplyEtherInWETH(uint256 amountInWETH) internal nonReentrant {
    // underlying here is WETH
    uint256 balance = underlying.balanceOf(address(this)); // supply at most "balance"
    if (amountInWETH < balance) {
      balance = amountInWETH; // only supply the "amount" if its less than what we have
    }
    WETH9 weth = WETH9(address(_weth));
    weth.withdraw(balance); // Unwrapping
    ICEther(address(ctoken)).mint.value(balance)();
  }

  /**
  * Redeems Ether from Compound
  * receives Ether. Wrap all the ether that is in this contract.
  */
  function _redeemEtherInCTokens(uint256 amountCTokens) internal nonReentrant {
    _redeemInCTokens(amountCTokens);
    WETH9 weth = WETH9(address(_weth));
    weth.deposit.value(address(this).balance)();
  }

  /**
  * Supplies to Compound
  */
  function _supply(uint256 amount) internal returns(uint256) {
    uint256 balance = underlying.balanceOf(address(this));
    if (amount < balance) {
      balance = amount;
    }
    underlying.safeApprove(address(ctoken), 0);
    underlying.safeApprove(address(ctoken), balance);
    uint256 mintResult = ctoken.mint(balance);
    require(mintResult == 0, "Supplying failed");
    return balance;
  }

  /**
  * Borrows against the collateral
  */
  function _borrow(
    uint256 amountUnderlying
  ) internal {
    // Borrow DAI, check the DAI balance for this contract's address
    uint256 result = ctoken.borrow(amountUnderlying);
    require(result == 0, "Borrow failed");
  }

  /**
  * Repays a loan
  */
  function _repay(uint256 amountUnderlying) internal {
    underlying.safeApprove(address(ctoken), 0);
    underlying.safeApprove(address(ctoken), amountUnderlying);
    ctoken.repayBorrow(amountUnderlying);
    underlying.safeApprove(address(ctoken), 0);
  }

  /**
  * Redeem liquidity in cTokens
  */
  function _redeemInCTokens(uint256 amountCTokens) internal {
    if(amountCTokens > 0){
      ctoken.redeem(amountCTokens);
    }
  }

  /**
  * Redeem liquidity in underlying
  */
  function _redeemUnderlying(uint256 amountUnderlying) internal {
    if (amountUnderlying > 0) {
      ctoken.redeemUnderlying(amountUnderlying);
    }
  }

  /**
  * Redeem liquidity in underlying
  */
  function redeemUnderlyingInWeth(uint256 amountUnderlying) internal {
    _redeemUnderlying(amountUnderlying);
    WETH9 weth = WETH9(address(_weth));
    weth.deposit.value(address(this).balance)();
  }

  /**
  * Get COMP
  */
  function claimComp() public {
    comptroller.claimComp(address(this));
  }

  /**
  * Redeem the minimum of the WETH we own, and the WETH that the cToken can
  * immediately retrieve. Ensures that `redeemMaximum` doesn't fail silently
  */
  function redeemMaximumWeth() internal {
      // amount of WETH in contract
      uint256 available = ctoken.getCash();
      // amount of WETH we own
      uint256 owned = ctoken.balanceOfUnderlying(address(this));

      // redeem the most we can redeem
      redeemUnderlyingInWeth(available < owned ? available : owned);
  }

  function getLiquidity() external view returns(uint256) {
    return ctoken.getCash();
  }

  function redeemMaximumToken() internal {
    // amount of tokens in ctoken
    uint256 available = ctoken.getCash();
    // amount of tokens we own
    uint256 owned = ctoken.balanceOfUnderlying(address(this));

    // redeem the most we can redeem
    _redeemUnderlying(available < owned ? available : owned);
  }

  function () external payable {} // this is needed for the WETH unwrapping
}

// File: contracts/Storage.sol

pragma solidity 0.5.16;

contract Storage {

  address public governance;
  address public controller;

  constructor() public {
    governance = msg.sender;
  }

  modifier onlyGovernance() {
    require(isGovernance(msg.sender), "Not governance");
    _;
  }

  function setGovernance(address _governance) public onlyGovernance {
    require(_governance != address(0), "new governance shouldn't be empty");
    governance = _governance;
  }

  function setController(address _controller) public onlyGovernance {
    require(_controller != address(0), "new controller shouldn't be empty");
    controller = _controller;
  }

  function isGovernance(address account) public view returns (bool) {
    return account == governance;
  }

  function isController(address account) public view returns (bool) {
    return account == controller;
  }
}

// File: contracts/Governable.sol

pragma solidity 0.5.16;


contract Governable {

  Storage public store;

  constructor(address _store) public {
    require(_store != address(0), "new storage shouldn't be empty");
    store = Storage(_store);
  }

  modifier onlyGovernance() {
    require(store.isGovernance(msg.sender), "Not governance");
    _;
  }

  function setStorage(address _store) public onlyGovernance {
    require(_store != address(0), "new storage shouldn't be empty");
    store = Storage(_store);
  }

  function governance() public view returns (address) {
    return store.governance();
  }
}

// File: contracts/Controllable.sol

pragma solidity 0.5.16;


contract Controllable is Governable {

  constructor(address _storage) Governable(_storage) public {
  }

  modifier onlyController() {
    require(store.isController(msg.sender), "Not a controller");
    _;
  }

  modifier onlyControllerOrGovernance(){
    require((store.isController(msg.sender) || store.isGovernance(msg.sender)),
      "The caller must be controller or governance");
    _;
  }

  function controller() public view returns (address) {
    return store.controller();
  }
}

// File: contracts/uniswap/interfaces/IUniswapV2Router01.sol

pragma solidity >=0.5.0;

interface IUniswapV2Router01 {
    function factory() external pure returns (address);
    function WETH() external pure returns (address);

    function addLiquidity(
        address tokenA,
        address tokenB,
        uint amountADesired,
        uint amountBDesired,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB, uint liquidity);
    function addLiquidityETH(
        address token,
        uint amountTokenDesired,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external payable returns (uint amountToken, uint amountETH, uint liquidity);
    function removeLiquidity(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB);
    function removeLiquidityETH(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external returns (uint amountToken, uint amountETH);
    function removeLiquidityWithPermit(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountA, uint amountB);
    function removeLiquidityETHWithPermit(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountToken, uint amountETH);
    function swapExactTokensForTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);
    function swapTokensForExactTokens(
        uint amountOut,
        uint amountInMax,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);
    function swapExactETHForTokens(uint amountOutMin, address[] calldata path, address to, uint deadline)
        external
        payable
        returns (uint[] memory amounts);
    function swapTokensForExactETH(uint amountOut, uint amountInMax, address[] calldata path, address to, uint deadline)
        external
        returns (uint[] memory amounts);
    function swapExactTokensForETH(uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline)
        external
        returns (uint[] memory amounts);
    function swapETHForExactTokens(uint amountOut, address[] calldata path, address to, uint deadline)
        external
        payable
        returns (uint[] memory amounts);

    function quote(uint amountA, uint reserveA, uint reserveB) external pure returns (uint amountB);
    function getAmountOut(uint amountIn, uint reserveIn, uint reserveOut) external pure returns (uint amountOut);
    function getAmountIn(uint amountOut, uint reserveIn, uint reserveOut) external pure returns (uint amountIn);
    function getAmountsOut(uint amountIn, address[] calldata path) external view returns (uint[] memory amounts);
    function getAmountsIn(uint amountOut, address[] calldata path) external view returns (uint[] memory amounts);
}

// File: contracts/uniswap/interfaces/IUniswapV2Router02.sol

pragma solidity >=0.5.0;


interface IUniswapV2Router02 {
    function factory() external pure returns (address);
    function WETH() external pure returns (address);

    function addLiquidity(
        address tokenA,
        address tokenB,
        uint amountADesired,
        uint amountBDesired,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB, uint liquidity);
    function addLiquidityETH(
        address token,
        uint amountTokenDesired,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external payable returns (uint amountToken, uint amountETH, uint liquidity);
    function removeLiquidity(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB);
    function removeLiquidityETH(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external returns (uint amountToken, uint amountETH);
    function removeLiquidityWithPermit(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountA, uint amountB);
    function removeLiquidityETHWithPermit(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountToken, uint amountETH);
    function swapExactTokensForTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);
    function swapTokensForExactTokens(
        uint amountOut,
        uint amountInMax,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);
    function swapExactETHForTokens(uint amountOutMin, address[] calldata path, address to, uint deadline)
        external
        payable
        returns (uint[] memory amounts);
    function swapTokensForExactETH(uint amountOut, uint amountInMax, address[] calldata path, address to, uint deadline)
        external
        returns (uint[] memory amounts);
    function swapExactTokensForETH(uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline)
        external
        returns (uint[] memory amounts);
    function swapETHForExactTokens(uint amountOut, address[] calldata path, address to, uint deadline)
        external
        payable
        returns (uint[] memory amounts);

    function quote(uint amountA, uint reserveA, uint reserveB) external pure returns (uint amountB);
    function getAmountOut(uint amountIn, uint reserveIn, uint reserveOut) external pure returns (uint amountOut);
    function getAmountIn(uint amountOut, uint reserveIn, uint reserveOut) external pure returns (uint amountIn);
    function getAmountsOut(uint amountIn, address[] calldata path) external view returns (uint[] memory amounts);
    function getAmountsIn(uint amountOut, address[] calldata path) external view returns (uint[] memory amounts);

    function removeLiquidityETHSupportingFeeOnTransferTokens(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external returns (uint amountETH);
    function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountETH);

    function swapExactTokensForTokensSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
    function swapExactETHForTokensSupportingFeeOnTransferTokens(
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external payable;
    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
}

// File: contracts/strategies/LiquidityRecipient.sol

pragma solidity 0.5.16;







contract LiquidityRecipient is Controllable {

  using SafeMath for uint256;
  using SafeERC20 for IERC20;

  event LiquidityProvided(uint256 farmIn, uint256 wethIn, uint256 lpOut);
  event LiquidityRemoved(uint256 lpIn, uint256 wethOut, uint256 farmOut);

  modifier onlyStrategy() {
    require(msg.sender == wethStrategy, "only the weth strategy");
    _;
  }

  modifier onlyStrategyOrGovernance() {
    require(msg.sender == wethStrategy || msg.sender == governance(),
      "only not the weth strategy or governance");
    _;
  }

  // Address for WETH
  address public weth;

  // Address for FARM
  address public farm;

  // The WETH strategy this contract is hooked up to. The strategy cannot be changed.
  address public wethStrategy;

  // The treasury to provide FARM, and to receive FARM or overdraft weth
  address public treasury;

  // The address of the uniswap router
  address public uniswap;

  // The UNI V2 LP token matching the pool
  address public uniLp;

  // These tokens cannot be claimed by the controller
  mapping(address => bool) public unsalvagableTokens;

  constructor(
    address _storage,
    address _weth,
    address _farm,
    address _treasury,
    address _uniswap,
    address _uniLp,
    address _wethStrategy
  )
  Controllable(_storage)
  public {
    weth = _weth;
    farm = _farm;
    require(_treasury != address(0), "treasury cannot be address(0)");
    treasury = _treasury;
    uniswap = _uniswap;
    require(_uniLp != address(0), "uniLp cannot be address(0)");
    uniLp = _uniLp;
    unsalvagableTokens[_weth] = true;
    unsalvagableTokens[_uniLp] = true;
    wethStrategy = _wethStrategy;
  }

  /**
  * Adds liquidity to Uniswap.
  */
  function addLiquidity() internal {
    uint256 farmBalance = IERC20(farm).balanceOf(address(this));
    uint256 wethBalance = IERC20(weth).balanceOf(address(this));

    IERC20(farm).safeApprove(uniswap, 0);
    IERC20(farm).safeApprove(uniswap, farmBalance);
    IERC20(weth).safeApprove(uniswap, 0);
    IERC20(weth).safeApprove(uniswap, wethBalance);

    (uint256 amountFarm,
    uint256 amountWeth,
    uint256 liquidity) = IUniswapV2Router02(uniswap).addLiquidity(farm,
        weth,
        farmBalance,
        wethBalance,
        0,
        0,
        address(this),
        block.timestamp);

    emit LiquidityProvided(amountFarm, amountWeth, liquidity);
  }

  /**
  * Removes liquidity from Uniswap.
  */
  function removeLiquidity() internal {
    uint256 lpBalance = IERC20(uniLp).balanceOf(address(this));
    if (lpBalance > 0) {
      IERC20(uniLp).safeApprove(uniswap, 0);
      IERC20(uniLp).safeApprove(uniswap, lpBalance);
      (uint256 amountFarm, uint256 amountWeth) = IUniswapV2Router02(uniswap).removeLiquidity(farm,
        weth,
        lpBalance,
        0,
        0,
        address(this),
        block.timestamp
      );
      emit LiquidityRemoved(lpBalance, amountWeth, amountFarm);
    } else {
      emit LiquidityRemoved(0, 0, 0);
    }
  }

  /**
  * Adds liquidity to Uniswap. There is no vault for this cannot be invoked via controller. It has
  * to be restricted for market manipulation reasons, so only governance can call this method.
  */
  function doHardWork() public onlyGovernance {
    addLiquidity();
  }

  /**
  * Borrows the set amount of WETH from the strategy, and will invest all available liquidity
  * to Uniswap. This assumes that an approval from the strategy exists.
  */
  function takeLoan(uint256 amount) public onlyStrategy {
    IERC20(weth).safeTransferFrom(wethStrategy, address(this), amount);
    addLiquidity();
  }

  /**
  * Prepares for settling the loan to the strategy by withdrawing all liquidity from Uniswap,
  * and providing approvals to the strategy (for WETH) and to treasury (for FARM). The strategy
  * will make the WETH withdrawal by the pull pattern, and so will the treasury.
  */
  function settleLoan() public onlyStrategyOrGovernance {
    removeLiquidity();
    IERC20(weth).safeApprove(wethStrategy, 0);
    IERC20(weth).safeApprove(wethStrategy, uint256(-1));
    IERC20(farm).safeApprove(treasury, 0);
    IERC20(farm).safeApprove(treasury, uint256(-1));
  }

  /**
  * If Uniswap returns less FARM and more WETH, the WETH excess will be present in this strategy.
  * The governance can send this WETH to the treasury by invoking this function through the
  * strategy. The strategy ensures that this function is not called unless the entire WETH loan
  * was settled.
  */
  function wethOverdraft() external onlyStrategy {
    IERC20(weth).safeTransfer(treasury, IERC20(weth).balanceOf(address(this)));
  }

  /**
  * Salvages a token.
  */
  function salvage(address recipient, address token, uint256 amount) external onlyGovernance {
    // To make sure that governance cannot come in and take away the coins
    require(!unsalvagableTokens[token], "token is defined as not salvagable");
    IERC20(token).safeTransfer(recipient, amount);
  }
}

// File: contracts/hardworkInterface/IController.sol

pragma solidity 0.5.16;

interface IController {
    // [Grey list]
    // An EOA can safely interact with the system no matter what.
    // If you're using Metamask, you're using an EOA.
    // Only smart contracts may be affected by this grey list.
    //
    // This contract will not be able to ban any EOA from the system
    // even if an EOA is being added to the greyList, he/she will still be able
    // to interact with the whole system as if nothing happened.
    // Only smart contracts will be affected by being added to the greyList.
    // This grey list is only used in Vault.sol, see the code there for reference
    function greyList(address _target) external view returns(bool);

    function addVaultAndStrategy(address _vault, address _strategy) external;
    function doHardWork(address _vault) external;
    function hasVault(address _vault) external returns(bool);

    function salvage(address _token, uint256 amount) external;
    function salvageStrategy(address _strategy, address _token, uint256 amount) external;

    function notifyFee(address _underlying, uint256 fee) external;
    function profitSharingNumerator() external view returns (uint256);
    function profitSharingDenominator() external view returns (uint256);
}

// File: contracts/strategies/RewardTokenProfitNotifier.sol

pragma solidity 0.5.16;






contract RewardTokenProfitNotifier is Controllable {
  using SafeMath for uint256;
  using SafeERC20 for IERC20;

  uint256 public profitSharingNumerator;
  uint256 public profitSharingDenominator;
  address public rewardToken;

  constructor(
    address _storage,
    address _rewardToken
  ) public Controllable(_storage){
    rewardToken = _rewardToken;
    // persist in the state for immutability of the fee
    profitSharingNumerator = 30; //IController(controller()).profitSharingNumerator();
    profitSharingDenominator = 100; //IController(controller()).profitSharingDenominator();
    require(profitSharingNumerator < profitSharingDenominator, "invalid profit share");
  }

  event ProfitLogInReward(uint256 profitAmount, uint256 feeAmount, uint256 timestamp);

  function notifyProfitInRewardToken(uint256 _rewardBalance) internal {
    if( _rewardBalance > 0 ){
      uint256 feeAmount = _rewardBalance.mul(profitSharingNumerator).div(profitSharingDenominator);
      emit ProfitLogInReward(_rewardBalance, feeAmount, block.timestamp);
      IERC20(rewardToken).safeApprove(controller(), 0);
      IERC20(rewardToken).safeApprove(controller(), feeAmount);
      
      IController(controller()).notifyFee(
        rewardToken,
        feeAmount
      );
    } else {
      emit ProfitLogInReward(0, 0, block.timestamp);
    }
  }

}

// File: contracts/hardworkInterface/IVault.sol

pragma solidity 0.5.16;

interface IVault {

    function underlyingBalanceInVault() external view returns (uint256);
    function underlyingBalanceWithInvestment() external view returns (uint256);

    // function store() external view returns (address);
    function governance() external view returns (address);
    function controller() external view returns (address);
    function underlying() external view returns (address);
    function strategy() external view returns (address);

    function setStrategy(address _strategy) external;
    function setVaultFractionToInvest(uint256 numerator, uint256 denominator) external;

    function deposit(uint256 amountWei) external;
    function depositFor(uint256 amountWei, address holder) external;

    function withdrawAll() external;
    function withdraw(uint256 numberOfShares) external;
    function getPricePerFullShare() external view returns (uint256);

    function underlyingBalanceWithInvestmentForHolder(address holder) view external returns (uint256);

    // hard work should be callable only by the controller (by the hard worker) or by governance
    function doHardWork() external;
    function rebalance() external;
}

// File: contracts/strategies/compound/CompoundNoFoldStrategy.sol

pragma solidity 0.5.16;















contract CompoundNoFoldStrategy is IStrategy, RewardTokenProfitNotifier, CompoundInteractor {

  using SafeMath for uint256;
  using SafeERC20 for IERC20;

  event ProfitNotClaimed();
  event TooLowBalance();

  ERC20Detailed public underlying;
  CompleteCToken public ctoken;
  ComptrollerInterface public comptroller;

  address public vault;
  ERC20Detailed public comp; // this will be Cream or Comp

  address public uniswapRouterV2;
  uint256 public suppliedInUnderlying;
  bool public liquidationAllowed = false;
  uint256 public sellFloor = 0;
  bool public allowEmergencyLiquidityShortage = false;

  // These tokens cannot be claimed by the controller
  mapping(address => bool) public unsalvagableTokens;

  modifier restricted() {
    require(msg.sender == vault || msg.sender == address(controller()) || msg.sender == address(governance()),
      "The sender has to be the controller or vault");
    _;
  }

  constructor(
    address _storage,
    address _underlying,
    address _ctoken,
    address _vault,
    address _comptroller,
    address _comp,
    address _uniswap
  )
  RewardTokenProfitNotifier(_storage, _comp)
  CompoundInteractor(_underlying, _ctoken, _comptroller) public {
    require(IVault(_vault).underlying() == _underlying, "vault does not support underlying");
    comptroller = ComptrollerInterface(_comptroller);
    comp = ERC20Detailed(_comp);
    underlying = ERC20Detailed(_underlying);
    ctoken = CompleteCToken(_ctoken);
    vault = _vault;
    uniswapRouterV2 = _uniswap;

    // set these tokens to be not salvagable
    unsalvagableTokens[_underlying] = true;
    unsalvagableTokens[_ctoken] = true;
    unsalvagableTokens[_comp] = true;
  }

  modifier updateSupplyInTheEnd() {
    _;
    suppliedInUnderlying = ctoken.balanceOfUnderlying(address(this));
  }

  function depositArbCheck() public view returns (bool) {
    // there's no arb here.
    return true;
  }

  /**
  * The strategy invests by supplying the underlying as a collateral.
  */
  function investAllUnderlying() public restricted updateSupplyInTheEnd {
    uint256 balance = underlying.balanceOf(address(this));
    _supply(balance);
  }

  /**
  * Exits Compound and transfers everything to the vault.
  */
  function withdrawAllToVault() external restricted updateSupplyInTheEnd {
    if (allowEmergencyLiquidityShortage) {
      withdrawMaximum();
    } else {
      withdrawAllWeInvested();
    }
    IERC20(address(underlying)).safeTransfer(vault, underlying.balanceOf(address(this)));
  }

  function emergencyExit() external onlyGovernance updateSupplyInTheEnd {
    withdrawMaximum();
  }

  function withdrawMaximum() internal updateSupplyInTheEnd {
    if (liquidationAllowed) {
      claimComp();
      liquidateComp();
    } else {
      emit ProfitNotClaimed();
    }
    redeemMaximum();
  }

  function withdrawAllWeInvested() internal updateSupplyInTheEnd {
    if (liquidationAllowed) {
      claimComp();
      liquidateComp();
    } else {
      emit ProfitNotClaimed();
    }
    uint256 currentBalance = ctoken.balanceOfUnderlying(address(this));
    mustRedeemPartial(currentBalance);
  }

  function withdrawToVault(uint256 amountUnderlying) external restricted updateSupplyInTheEnd {
    if (amountUnderlying <= underlying.balanceOf(address(this))) {
      IERC20(address(underlying)).safeTransfer(vault, amountUnderlying);
      return;
    }

    // get some of the underlying
    mustRedeemPartial(amountUnderlying);

    // transfer the amount requested (or the amount we have) back to vault
    IERC20(address(underlying)).safeTransfer(vault, amountUnderlying);

    // invest back to cream
    investAllUnderlying();
  }

  /**
  * Withdraws all assets, liquidates COMP/CREAM, and invests again in the required ratio.
  */
  function doHardWork() public restricted {
    if (liquidationAllowed) {
      claimComp();
      liquidateComp();
    } else {
      emit ProfitNotClaimed();
    }
    investAllUnderlying();
  }

  /**
  * Redeems maximum that can be redeemed from Compound.
  * Redeem the minimum of the underlying we own, and the underlying that the cToken can
  * immediately retrieve. Ensures that `redeemMaximum` doesn't fail silently.
  *
  * DOES NOT ensure that the strategy cUnderlying balance becomes 0.
  */
  function redeemMaximum() internal {
    redeemMaximumToken();
  }

  /**
  * Redeems `amountUnderlying` or fails.
  */
  function mustRedeemPartial(uint256 amountUnderlying) internal {
    require(
      ctoken.getCash() >= amountUnderlying,
      "market cash cannot cover liquidity"
    );
    _redeemUnderlying(amountUnderlying);
  }

  /**
  * Salvages a token.
  */
  function salvage(address recipient, address token, uint256 amount) public onlyGovernance {
    // To make sure that governance cannot come in and take away the coins
    require(!unsalvagableTokens[token], "token is defined as not salvagable");
    IERC20(token).safeTransfer(recipient, amount);
  }

  function liquidateComp() internal {
    uint256 balance = comp.balanceOf(address(this));
    if (balance < sellFloor) {
      emit TooLowBalance();
      return;
    }

    // give a profit share to fee forwarder, which re-distributes this to
    // the profit sharing pools
    notifyProfitInRewardToken(balance);

    balance = comp.balanceOf(address(this));
    // we can accept 1 as minimum as this will be called by trusted roles only
    uint256 amountOutMin = 1;
    IERC20(address(comp)).safeApprove(address(uniswapRouterV2), 0);
    IERC20(address(comp)).safeApprove(address(uniswapRouterV2), balance);
    address[] memory path = new address[](3);
    path[0] = address(comp);
    path[1] = IUniswapV2Router02(uniswapRouterV2).WETH();
    path[2] = address(underlying);
    IUniswapV2Router02(uniswapRouterV2).swapExactTokensForTokens(
      balance,
      amountOutMin,
      path,
      address(this),
      block.timestamp
    );
  }

  /**
  * Returns the current balance. Ignores COMP/CREAM that was not liquidated and invested.
  */
  function investedUnderlyingBalance() public view returns (uint256) {
    // underlying in this strategy + underlying redeemable from Compound/Cream
    return underlying.balanceOf(address(this)).add(suppliedInUnderlying);
  }

  /**
  * Allows liquidation
  */
  function setLiquidationAllowed(
    bool allowed
  ) external restricted {
    liquidationAllowed = allowed;
  }

  function setAllowLiquidityShortage(
    bool allowed
  ) external restricted {
    allowEmergencyLiquidityShortage = allowed;
  }

  function setSellFloor(uint256 value) external restricted {
    sellFloor = value;
  }
}

// File: contracts/strategies/compound/CompoundNoFoldStrategyUSDTMainnet.sol

pragma solidity 0.5.16;


contract CompoundNoFoldStrategyUSDTMainnet is CompoundNoFoldStrategy {

  // token addresses
  address constant public __underlying = address(0xdAC17F958D2ee523a2206206994597C13D831ec7);
  address constant public __ctoken = address(0xf650C3d88D12dB855b8bf7D11Be6C55A4e07dCC9);
  address constant public __comptroller = address(0x3d9819210A31b4961b30EF54bE2aeD79B9c9Cd3B);
  address constant public __comp = address(0xc00e94Cb662C3520282E6f5717214004A7f26888);
  address constant public __uniswap = address(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);

  constructor(
    address _storage,
    address _vault
  )
  CompoundNoFoldStrategy(
    _storage,
    __underlying,
    __ctoken,
    _vault,
    __comptroller,
    __comp,
    __uniswap
  )
  public {
  }

}