// File: @openzeppelin/contracts/math/SafeMath.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/**
 * @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.
     */
    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;
    }
}

// File: @openzeppelin/contracts/token/ERC20/IERC20.sol



pragma solidity ^0.6.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
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/utils/Address.sol



pragma solidity ^0.6.2;

/**
 * @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) {
        // 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);
            }
        }
    }
}

// File: @openzeppelin/contracts/token/ERC20/SafeERC20.sol



pragma solidity ^0.6.0;




/**
 * @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 IERC20;` 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));
    }

    /**
     * @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 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. 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");
        }
    }
}

// File: contracts/interfaces/flamincome/Controller.sol


pragma solidity ^0.6.2;

interface Controller {
    function strategist() external view returns (address);
    function vaults(address) external view returns (address);
    function rewards() external view returns (address);
    function balanceOf(address) external view returns (uint);
    function withdraw(address, uint) external;
    function earn(address, uint) external;
}

// File: contracts/interfaces/flamincome/Vault.sol


pragma solidity ^0.6.2;

interface Vault {
    function token() external view returns (address);
    function priceE18() external view returns (uint);
    function deposit(uint) external;
    function withdraw(uint) external;
    function depositAll() external;
    function withdrawAll() external;
}

// File: contracts/interfaces/external/Gauge.sol


pragma solidity ^0.6.2;

interface IGauge {
    function deposit(uint) external;
    function balanceOf(address) external view returns (uint);
    function withdraw(uint) external;
    function user_checkpoint(address) external;
}

interface VotingEscrow {
    function create_lock(uint256 v, uint256 time) external;
    function increase_amount(uint256 _value) external;
    function increase_unlock_time(uint256 _unlock_time) external;
    function withdraw() external;
}

interface IMintr {
    function mint(address) external;
}

// File: contracts/interfaces/external/Curve.sol


pragma solidity ^0.6.2;

interface ICurveFi {
  function coins(int128) external view returns (address);
  function get_virtual_price() external view returns (uint);
  function add_liquidity(uint256[4] calldata amounts, uint256 min_mint_amount) external;
  function remove_liquidity_imbalance(uint256[4] calldata amounts, uint256 max_burn_amount) external;
  function remove_liquidity(uint256 _amount, uint256[4] calldata amounts) external;
  function exchange(int128 from, int128 to, uint256 _from_amount, uint256 _min_to_amount) external;
  function exchange_underlying(int128 from, int128 to, uint256 _from_amount, uint256 _min_to_amount) external;
}

interface ICurveFiBTC {
  function coins(int128) external view returns (address);
  function get_virtual_price() external view returns (uint);
  function add_liquidity(uint256[3] calldata amounts, uint256 min_mint_amount) external;
  function remove_liquidity_imbalance(uint256[3] calldata amounts, uint256 max_burn_amount) external;
  function remove_liquidity(uint256 _amount, uint256[3] calldata amounts) external;
  function exchange(int128 from, int128 to, uint256 _from_amount, uint256 _min_to_amount) external;
  function exchange_underlying(int128 from, int128 to, uint256 _from_amount, uint256 _min_to_amount) external;
}

interface ICurveFiREN {
  function coins(int128) external view returns (address);
  function get_virtual_price() external view returns (uint);
  function add_liquidity(uint256[2] calldata amounts, uint256 min_mint_amount) external;
  function remove_liquidity_imbalance(uint256[2] calldata amounts, uint256 max_burn_amount) external;
  function remove_liquidity(uint256 _amount, uint256[2] calldata amounts) external;
  function exchange(int128 from, int128 to, uint256 _from_amount, uint256 _min_to_amount) external;
  function exchange_underlying(int128 from, int128 to, uint256 _from_amount, uint256 _min_to_amount) external;
}

// File: contracts/interfaces/external/Uniswap.sol


pragma solidity ^0.6.2;

interface IUniV2 {
    function swapExactTokensForTokens(uint, uint, address[] calldata, address, uint) external;
}

interface UniSwapV1 {
    function tokenAddress() external view returns (address token);
    function factoryAddress() external view returns (address factory);
    function addLiquidity(uint256 min_liquidity, uint256 max_tokens, uint256 deadline) external payable returns (uint256);
    function removeLiquidity(uint256 amount, uint256 min_eth, uint256 min_tokens, uint256 deadline) external returns (uint256, uint256);
    function getEthToTokenInputPrice(uint256 eth_sold) external view returns (uint256 tokens_bought);
    function getEthToTokenOutputPrice(uint256 tokens_bought) external view returns (uint256 eth_sold);
    function getTokenToEthInputPrice(uint256 tokens_sold) external view returns (uint256 eth_bought);
    function getTokenToEthOutputPrice(uint256 eth_bought) external view returns (uint256 tokens_sold);
    function ethToTokenSwapInput(uint256 min_tokens, uint256 deadline) external payable returns (uint256  tokens_bought);
    function ethToTokenTransferInput(uint256 min_tokens, uint256 deadline, address recipient) external payable returns (uint256  tokens_bought);
    function ethToTokenSwapOutput(uint256 tokens_bought, uint256 deadline) external payable returns (uint256  eth_sold);
    function ethToTokenTransferOutput(uint256 tokens_bought, uint256 deadline, address recipient) external payable returns (uint256  eth_sold);
    function tokenToEthSwapInput(uint256 tokens_sold, uint256 min_eth, uint256 deadline) external returns (uint256  eth_bought);
    function tokenToEthTransferInput(uint256 tokens_sold, uint256 min_eth, uint256 deadline, address recipient) external returns (uint256  eth_bought);
    function tokenToEthSwapOutput(uint256 eth_bought, uint256 max_tokens, uint256 deadline) external returns (uint256  tokens_sold);
    function tokenToEthTransferOutput(uint256 eth_bought, uint256 max_tokens, uint256 deadline, address recipient) external returns (uint256  tokens_sold);
    function tokenToTokenSwapInput(uint256 tokens_sold, uint256 min_tokens_bought, uint256 min_eth_bought, uint256 deadline, address token_addr) external returns (uint256  tokens_bought);
    function tokenToTokenTransferInput(uint256 tokens_sold, uint256 min_tokens_bought, uint256 min_eth_bought, uint256 deadline, address recipient, address token_addr) external returns (uint256  tokens_bought);
    function tokenToTokenSwapOutput(uint256 tokens_bought, uint256 max_tokens_sold, uint256 max_eth_sold, uint256 deadline, address token_addr) external returns (uint256  tokens_sold);
    function tokenToTokenTransferOutput(uint256 tokens_bought, uint256 max_tokens_sold, uint256 max_eth_sold, uint256 deadline, address recipient, address token_addr) external returns (uint256  tokens_sold);
    function tokenToExchangeSwapInput(uint256 tokens_sold, uint256 min_tokens_bought, uint256 min_eth_bought, uint256 deadline, address exchange_addr) external returns (uint256  tokens_bought);
    function tokenToExchangeTransferInput(uint256 tokens_sold, uint256 min_tokens_bought, uint256 min_eth_bought, uint256 deadline, address recipient, address exchange_addr) external returns (uint256  tokens_bought);
    function tokenToExchangeSwapOutput(uint256 tokens_bought, uint256 max_tokens_sold, uint256 max_eth_sold, uint256 deadline, address exchange_addr) external returns (uint256  tokens_sold);
    function tokenToExchangeTransferOutput(uint256 tokens_bought, uint256 max_tokens_sold, uint256 max_eth_sold, uint256 deadline, address recipient, address exchange_addr) external returns (uint256  tokens_sold);
    function transfer(address _to, uint256 _value) external returns (bool);
    function transferFrom(address _from, address _to, uint256 value) external returns (bool);
    function approve(address _spender, uint256 _value) external returns (bool);
    function allowance(address _owner, address _spender) external view returns (uint256);
    function balanceOf(address _owner) external view returns (uint256);
    function totalSupply() external view returns (uint256);
}

interface IUniStakingRewards{
    function balanceOf(address account) external view returns (uint256);
    function stake(uint256 amount) external;
    function withdraw(uint256 amount) external;
    function getReward() external;
    function rewardPerToken() external;
    function exit() external;
}

interface IUniswapV2Router02{
    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 swapExactTokensForTokens(uint, uint, address[] calldata, address, uint) external;
}

// File: contracts/interfaces/external/YFI.sol


pragma solidity ^0.6.2;

interface IYFIVault {
  function token() external view returns (address);
  function deposit(uint256 _amount) external;
  function depositAll() external;
  function withdrawAll() external;
  function withdraw(uint256 _amount) external;
  function getPricePerFullShare() external view returns (uint);
  function earn() external;
}

// File: @openzeppelin/contracts/math/Math.sol



pragma solidity ^0.6.0;

/**
 * @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: contracts/implementations/strategy/StrategyBaseline.sol


pragma solidity ^0.6.2;







abstract contract StrategyBaseline {
    using SafeERC20 for IERC20;
    using Address for address;
    using SafeMath for uint256;

    address public want;
    address public governance;
    address public controller;

    constructor(address _want, address _controller) public {
        governance = msg.sender;
        controller = _controller;
        want = _want;
    }

    function deposit() public virtual;

    function withdraw(IERC20 _asset) external virtual returns (uint256 balance);

    function withdraw(uint256 _amount) external virtual;

    function withdrawAll() external virtual returns (uint256 balance);

    function balanceOf() public virtual view returns (uint256);

    function SetGovernance(address _governance) external {
        require(msg.sender == governance, "!governance");
        governance = _governance;
    }

    function SetController(address _controller) external {
        require(msg.sender == governance, "!governance");
        controller = _controller;
    }
}

// File: contracts/implementations/strategy/StrategyBaselineCarbon.sol


pragma solidity ^0.6.2;








abstract contract StrategyBaselineCarbon is StrategyBaseline {
    using SafeERC20 for IERC20;
    using Address for address;
    using SafeMath for uint256;

    uint256 public feen = 5e15;
    uint256 public constant feed = 1e18;

    constructor(address _want, address _controller)
        public
        StrategyBaseline(_want, _controller)
    {}

    function DepositToken(uint256 _amount) internal virtual;

    function WithdrawToken(uint256 _amount) internal virtual;

    function Harvest() external virtual;

    function GetDeposited() public virtual view returns (uint256);

    function deposit() public override {
        uint256 _want = IERC20(want).balanceOf(address(this));
        if (_want > 0) {
            DepositToken(_want);
        }
    }

    function withdraw(IERC20 _asset)
        external
        override
        returns (uint256 balance)
    {
        require(msg.sender == controller, "!controller");
        require(want != address(_asset), "want");
        balance = _asset.balanceOf(address(this));
        _asset.safeTransfer(controller, balance);
    }

    function withdraw(uint256 _aw) external override {
        require(msg.sender == controller, "!controller");
        uint256 _w = IERC20(want).balanceOf(address(this));
        if (_w < _aw) {
            WithdrawToken(_aw.sub(_w));
        }
        _w = IERC20(want).balanceOf(address(this));
        address _vault = Controller(controller).vaults(address(want));
        require(_vault != address(0), "!vault");
        IERC20(want).safeTransfer(_vault, Math.min(_aw, _w));
    }

    function withdrawAll() external override returns (uint256 balance) {
        require(msg.sender == controller, "!controller");
        WithdrawToken(GetDeposited());
        balance = IERC20(want).balanceOf(address(this));
        address _vault = Controller(controller).vaults(address(want));
        require(_vault != address(0), "!vault");
        IERC20(want).safeTransfer(_vault, balance);
    }

    function balanceOf() public override view returns (uint256) {
        uint256 _want = IERC20(want).balanceOf(address(this));
        return GetDeposited().add(_want);
    }

    function setFeeN(uint256 _feen) external {
        require(msg.sender == governance, "!governance");
        feen = _feen;
    }
}

// File: contracts/implementations/strategy/StrategyBaselineCarbonGaugeREN.sol


pragma solidity ^0.6.2;












contract StrategyBaselineCarbonGaugeREN is StrategyBaselineCarbon {
    using SafeERC20 for IERC20;
    using Address for address;
    using SafeMath for uint256;

    address public constant crvbtc = address(
        0x49849C98ae39Fff122806C06791Fa73784FB3675
    );
    address public constant pool = address(
        0xB1F2cdeC61db658F091671F5f199635aEF202CAC
    );
    address public constant mintr = address(
        0xd061D61a4d941c39E5453435B6345Dc261C2fcE0
    );
    address public constant crv = address(
        0xD533a949740bb3306d119CC777fa900bA034cd52
    );
    address public constant uni = address(
        0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D
    );
    address public constant weth = address(
        0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2
    );
    address public constant wbtc = address(
        0x2260FAC5E5542a773Aa44fBCfeDf7C193bc2C599
    );
    address public constant curve = address(
        0x93054188d876f558f4a66B2EF1d97d16eDf0895B
    );

    constructor(address _controller)
        public
        StrategyBaselineCarbon(crvbtc, _controller)
    {}

    function DepositToken(uint256 _amount) internal override {
        IERC20(want).safeApprove(pool, 0);
        IERC20(want).safeApprove(pool, _amount);
        IGauge(pool).deposit(_amount);
    }

    function WithdrawToken(uint256 _amount) internal override {
        IGauge(pool).withdraw(_amount);
    }

    function Harvest() external override {
        require(msg.sender == Controller(controller).strategist() || msg.sender == governance, "!permission");
        IMintr(mintr).mint(pool);
        uint256 _crv = IERC20(crv).balanceOf(address(this));
        if (_crv > 0) {
            uint256 _fee = _crv.mul(feen).div(feed);
            IERC20(crv).safeTransfer(Controller(controller).rewards(), _fee);
            _crv = _crv.sub(_fee);
            IERC20(crv).safeApprove(uni, 0);
            IERC20(crv).safeApprove(uni, _crv);
            address[] memory path = new address[](3);
            path[0] = crv;
            path[1] = weth;
            path[2] = wbtc;
            IUniV2(uni).swapExactTokensForTokens(
                _crv,
                uint256(0),
                path,
                address(this),
                now.add(1800)
            );
            uint256 _wbtc = IERC20(wbtc).balanceOf(address(this));
            IERC20(wbtc).safeApprove(curve, 0);
            IERC20(wbtc).safeApprove(curve, _wbtc);
            uint256[2] memory vec = [
                uint256(0),
                uint256(0)
            ];
            vec[1] = _wbtc;
            ICurveFiREN(curve).add_liquidity(vec, 0);
        }
    }

    function GetDeposited() public override view returns (uint256) {
        return IGauge(pool).balanceOf(address(this));
    }
}

// File: contracts/instances/StrategyBaselineCarbonGaugeRENInstance.sol


pragma solidity ^0.6.2;


contract StrategyBaselineCarbonGaugeRENInstance is StrategyBaselineCarbonGaugeREN {
    constructor()
        public
        StrategyBaselineCarbonGaugeREN(
            address(0xDc03b4900Eff97d997f4B828ae0a45cd48C3b22d)
        )
    {}
}