// File: contracts/DreverInu.sol



// SPDX-License-Identifier: MIT

pragma solidity 0.8.9;

abstract contract Context {
	function _msgSender() internal view virtual returns (address) {
		return msg.sender;
	}

	function _msgData() internal view virtual returns (bytes calldata) {
		this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
		return msg.data;
	}
}

interface IUniswapV2Pair {
	event Approval(address indexed owner, address indexed spender, uint256 value);
	event Transfer(address indexed from, address indexed to, uint256 value);

	function name() external pure returns (string memory);

	function symbol() external pure returns (string memory);

	function decimals() external pure returns (uint8);

	function totalSupply() external view returns (uint256);

	function balanceOf(address owner) external view returns (uint256);

	function allowance(address owner, address spender) external view returns (uint256);

	function approve(address spender, uint256 value) external returns (bool);

	function transfer(address to, uint256 value) external returns (bool);

	function transferFrom(
		address from,
		address to,
		uint256 value
	) external returns (bool);

	function DOMAIN_SEPARATOR() external view returns (bytes32);

	function PERMIT_TYPEHASH() external pure returns (bytes32);

	function nonces(address owner) external view returns (uint256);

	function permit(
		address owner,
		address spender,
		uint256 value,
		uint256 deadline,
		uint8 v,
		bytes32 r,
		bytes32 s
	) external;

	event Mint(address indexed sender, uint256 amount0, uint256 amount1);
	event Burn(address indexed sender, uint256 amount0, uint256 amount1, address indexed to);
	event Swap(address indexed sender, uint256 amount0In, uint256 amount1In, uint256 amount0Out, uint256 amount1Out, address indexed to);
	event Sync(uint112 reserve0, uint112 reserve1);

	function MINIMUM_LIQUIDITY() external pure returns (uint256);

	function factory() external view returns (address);

	function token0() external view returns (address);

	function token1() external view returns (address);

	function getReserves()
		external
		view
		returns (
			uint112 reserve0,
			uint112 reserve1,
			uint32 blockTimestampLast
		);

	function price0CumulativeLast() external view returns (uint256);

	function price1CumulativeLast() external view returns (uint256);

	function kLast() external view returns (uint256);

	function mint(address to) external returns (uint256 liquidity);

	function burn(address to) external returns (uint256 amount0, uint256 amount1);

	function swap(
		uint256 amount0Out,
		uint256 amount1Out,
		address to,
		bytes calldata data
	) external;

	function skim(address to) external;

	function sync() external;

	function initialize(address, address) external;
}

interface IUniswapV2Factory {
	event PairCreated(address indexed token0, address indexed token1, address pair, uint256);

	function feeTo() external view returns (address);

	function feeToSetter() external view returns (address);

	function getPair(address tokenA, address tokenB) external view returns (address pair);

	function allPairs(uint256) external view returns (address pair);

	function allPairsLength() external view returns (uint256);

	function createPair(address tokenA, address tokenB) external returns (address pair);

	function setFeeTo(address) external;

	function setFeeToSetter(address) external;
}

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
	 * transacgtion 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);
}

interface IERC20Metadata is IERC20 {
	/**
	 * @dev Returns the name of the token.
	 */
	function name() external view returns (string memory);

	/**
	 * @dev Returns the symbol of the token.
	 */
	function symbol() external view returns (string memory);

	/**
	 * @dev Returns the decimals places of the token.
	 */
	function decimals() external view returns (uint8);
}

contract ERC20 is Context, IERC20, IERC20Metadata {
	using SafeMath for uint256;

	mapping(address => uint256) private _balances;

	mapping(address => mapping(address => uint256)) private _allowances;

	uint256 private _totalSupply;

	string private _name;
	string private _symbol;

	/**
	 * @dev Sets the values for {name} and {symbol}.
	 *
	 * The default value of {decimals} is 18. To select a different value for
	 * {decimals} you should overload it.
	 *
	 * All two of these values are immutable: they can only be set once during
	 * construction.
	 */
	constructor(string memory name_, string memory symbol_) {
		_name = name_;
		_symbol = symbol_;
	}

	/**
	 * @dev Returns the name of the token.
	 */
	function name() public view virtual override returns (string memory) {
		return _name;
	}

	/**
	 * @dev Returns the symbol of the token, usually a shorter version of the
	 * name.
	 */
	function symbol() public view virtual override 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. This is the value {ERC20} uses, unless this function is
	 * overridden;
	 *
	 * 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 virtual override returns (uint8) {
		return 18;
	}

	/**
	 * @dev See {IERC20-totalSupply}.
	 */
	function totalSupply() public view virtual override returns (uint256) {
		return _totalSupply;
	}

	/**
	 * @dev See {IERC20-balanceOf}.
	 */
	function balanceOf(address account) public view virtual override returns (uint256) {
		return _balances[account];
	}

	/**
	 * @dev See {IERC20-transfer}.
	 *
	 * Requirements:
	 *
	 * - `recipient` cannot be the zero address.
	 * - the caller must have a balance of at least `amount`.
	 */
	function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
		_transfer(_msgSender(), recipient, amount);
		return true;
	}

	/**
	 * @dev See {IERC20-allowance}.
	 */
	function allowance(address owner, address spender) public view virtual override returns (uint256) {
		return _allowances[owner][spender];
	}

	/**
	 * @dev See {IERC20-approve}.
	 *
	 * Requirements:
	 *
	 * - `spender` cannot be the zero address.
	 */
	function approve(address spender, uint256 amount) public virtual override returns (bool) {
		_approve(_msgSender(), spender, amount);
		return true;
	}

	/**
	 * @dev See {IERC20-transferFrom}.
	 *
	 * Emits an {Approval} event indicating the updated allowance. This is not
	 * required by the EIP. See the note at the beginning of {ERC20}.
	 *
	 * Requirements:
	 *
	 * - `sender` and `recipient` cannot be the zero address.
	 * - `sender` must have a balance of at least `amount`.
	 * - the caller must have allowance for ``sender``'s tokens of at least
	 * `amount`.
	 */
	function transferFrom(
		address sender,
		address recipient,
		uint256 amount
	) public virtual override returns (bool) {
		_transfer(sender, recipient, amount);
		_approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
		return true;
	}

	/**
	 * @dev Atomically increases the allowance granted to `spender` by the caller.
	 *
	 * This is an alternative to {approve} that can be used as a mitigation for
	 * problems described in {IERC20-approve}.
	 *
	 * Emits an {Approval} event indicating the updated allowance.
	 *
	 * Requirements:
	 *
	 * - `spender` cannot be the zero address.
	 */
	function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
		_approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
		return true;
	}

	/**
	 * @dev Atomically decreases the allowance granted to `spender` by the caller.
	 *
	 * This is an alternative to {approve} that can be used as a mitigation for
	 * problems described in {IERC20-approve}.
	 *
	 * Emits an {Approval} event indicating the updated allowance.
	 *
	 * Requirements:
	 *
	 * - `spender` cannot be the zero address.
	 * - `spender` must have allowance for the caller of at least
	 * `subtractedValue`.
	 */
	function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
		_approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
		return true;
	}

	/**
	 * @dev Moves tokens `amount` from `sender` to `recipient`.
	 *
	 * This is internal function is equivalent to {transfer}, and can be used to
	 * e.g. implement automatic token fees, slashing mechanisms, etc.
	 *
	 * Emits a {Transfer} event.
	 *
	 * Requirements:
	 *
	 * - `sender` cannot be the zero address.
	 * - `recipient` cannot be the zero address.
	 * - `sender` must have a balance of at least `amount`.
	 */
	function _transfer(
		address sender,
		address recipient,
		uint256 amount
	) internal virtual {
		require(sender != address(0), "ERC20: transfer from the zero address");
		require(recipient != address(0), "ERC20: transfer to the zero address");

		_beforeTokenTransfer(sender, recipient, amount);

		_balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
		_balances[recipient] = _balances[recipient].add(amount);
		emit Transfer(sender, recipient, amount);
	}

	/** @dev Creates `amount` tokens and assigns them to `account`, increasing
	 * the total supply.
	 *
	 * Emits a {Transfer} event with `from` set to the zero address.
	 *
	 * Requirements:
	 *
	 * - `account` cannot be the zero address.
	 */
	function _mint(address account, uint256 amount) internal virtual {
		require(account != address(0), "ERC20: mint to the zero address");

		_beforeTokenTransfer(address(0), account, amount);

		_totalSupply = _totalSupply.add(amount);
		_balances[account] = _balances[account].add(amount);
		emit Transfer(address(0), account, amount);
	}

	/**
	 * @dev Destroys `amount` tokens from `account`, reducing the
	 * total supply.
	 *
	 * Emits a {Transfer} event with `to` set to the zero address.
	 *
	 * Requirements:
	 *
	 * - `account` cannot be the zero address.
	 * - `account` must have at least `amount` tokens.
	 */
	function _burn(address account, uint256 amount) internal virtual {
		require(account != address(0), "ERC20: burn from the zero address");

		_beforeTokenTransfer(account, address(0), amount);

		_balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
		_totalSupply = _totalSupply.sub(amount);
		emit Transfer(account, address(0), amount);
	}

	/**
	 * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
	 *
	 * This internal function is equivalent to `approve`, and can be used to
	 * e.g. set automatic allowances for certain subsystems, etc.
	 *
	 * Emits an {Approval} event.
	 *
	 * Requirements:
	 *
	 * - `owner` cannot be the zero address.
	 * - `spender` cannot be the zero address.
	 */
	function _approve(
		address owner,
		address spender,
		uint256 amount
	) internal virtual {
		require(owner != address(0), "ERC20: approve from the zero address");
		require(spender != address(0), "ERC20: approve to the zero address");

		_allowances[owner][spender] = amount;
		emit Approval(owner, spender, amount);
	}

	/**
	 * @dev Hook that is called before any transfer of tokens. This includes
	 * minting and burning.
	 *
	 * Calling conditions:
	 *
	 * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
	 * will be to transferred to `to`.
	 * - when `from` is zero, `amount` tokens will be minted for `to`.
	 * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
	 * - `from` and `to` are never both zero.
	 *
	 * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
	 */
	function _beforeTokenTransfer(
		address from,
		address to,
		uint256 amount
	) internal virtual {}
}

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;
	}
}

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() {
		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(_owner == _msgSender(), "Ownable: caller is not the 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 virtual 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 virtual onlyOwner {
		require(newOwner != address(0), "Ownable: new owner is the zero address");
		emit OwnershipTransferred(_owner, newOwner);
		_owner = newOwner;
	}
}

library SafeMathInt {
	int256 private constant MIN_INT256 = int256(1) << 255;
	int256 private constant MAX_INT256 = ~(int256(1) << 255);

	/**
	 * @dev Multiplies two int256 variables and fails on overflow.
	 */
	function mul(int256 a, int256 b) internal pure returns (int256) {
		int256 c = a * b;

		// Detect overflow when multiplying MIN_INT256 with -1
		require(c != MIN_INT256 || (a & MIN_INT256) != (b & MIN_INT256));
		require((b == 0) || (c / b == a));
		return c;
	}

	/**
	 * @dev Division of two int256 variables and fails on overflow.
	 */
	function div(int256 a, int256 b) internal pure returns (int256) {
		// Prevent overflow when dividing MIN_INT256 by -1
		require(b != -1 || a != MIN_INT256);

		// Solidity already throws when dividing by 0.
		return a / b;
	}

	/**
	 * @dev Subtracts two int256 variables and fails on overflow.
	 */
	function sub(int256 a, int256 b) internal pure returns (int256) {
		int256 c = a - b;
		require((b >= 0 && c <= a) || (b < 0 && c > a));
		return c;
	}

	/**
	 * @dev Adds two int256 variables and fails on overflow.
	 */
	function add(int256 a, int256 b) internal pure returns (int256) {
		int256 c = a + b;
		require((b >= 0 && c >= a) || (b < 0 && c < a));
		return c;
	}

	/**
	 * @dev Converts to absolute value, and fails on overflow.
	 */
	function abs(int256 a) internal pure returns (int256) {
		require(a != MIN_INT256);
		return a < 0 ? -a : a;
	}

	function toUint256Safe(int256 a) internal pure returns (uint256) {
		require(a >= 0);
		return uint256(a);
	}
}

library SafeMathUint {
	function toInt256Safe(uint256 a) internal pure returns (int256) {
		int256 b = int256(a);
		require(b >= 0);
		return b;
	}
}

interface IUniswapV2Router01 {
	function factory() external pure returns (address);

	function WETH() external pure returns (address);

	function addLiquidity(
		address tokenA,
		address tokenB,
		uint256 amountADesired,
		uint256 amountBDesired,
		uint256 amountAMin,
		uint256 amountBMin,
		address to,
		uint256 deadline
	)
		external
		returns (
			uint256 amountA,
			uint256 amountB,
			uint256 liquidity
		);

	function addLiquidityETH(
		address token,
		uint256 amountTokenDesired,
		uint256 amountTokenMin,
		uint256 amountETHMin,
		address to,
		uint256 deadline
	)
		external
		payable
		returns (
			uint256 amountToken,
			uint256 amountETH,
			uint256 liquidity
		);

	function removeLiquidity(
		address tokenA,
		address tokenB,
		uint256 liquidity,
		uint256 amountAMin,
		uint256 amountBMin,
		address to,
		uint256 deadline
	) external returns (uint256 amountA, uint256 amountB);

	function removeLiquidityETH(
		address token,
		uint256 liquidity,
		uint256 amountTokenMin,
		uint256 amountETHMin,
		address to,
		uint256 deadline
	) external returns (uint256 amountToken, uint256 amountETH);

	function removeLiquidityWithPermit(
		address tokenA,
		address tokenB,
		uint256 liquidity,
		uint256 amountAMin,
		uint256 amountBMin,
		address to,
		uint256 deadline,
		bool approveMax,
		uint8 v,
		bytes32 r,
		bytes32 s
	) external returns (uint256 amountA, uint256 amountB);

	function removeLiquidityETHWithPermit(
		address token,
		uint256 liquidity,
		uint256 amountTokenMin,
		uint256 amountETHMin,
		address to,
		uint256 deadline,
		bool approveMax,
		uint8 v,
		bytes32 r,
		bytes32 s
	) external returns (uint256 amountToken, uint256 amountETH);

	function swapExactTokensForTokens(
		uint256 amountIn,
		uint256 amountOutMin,
		address[] calldata path,
		address to,
		uint256 deadline
	) external returns (uint256[] memory amounts);

	function swapTokensForExactTokens(
		uint256 amountOut,
		uint256 amountInMax,
		address[] calldata path,
		address to,
		uint256 deadline
	) external returns (uint256[] memory amounts);

	function swapExactETHForTokens(
		uint256 amountOutMin,
		address[] calldata path,
		address to,
		uint256 deadline
	) external payable returns (uint256[] memory amounts);

	function swapTokensForExactETH(
		uint256 amountOut,
		uint256 amountInMax,
		address[] calldata path,
		address to,
		uint256 deadline
	) external returns (uint256[] memory amounts);

	function swapExactTokensForETH(
		uint256 amountIn,
		uint256 amountOutMin,
		address[] calldata path,
		address to,
		uint256 deadline
	) external returns (uint256[] memory amounts);

	function swapETHForExactTokens(
		uint256 amountOut,
		address[] calldata path,
		address to,
		uint256 deadline
	) external payable returns (uint256[] memory amounts);

	function quote(
		uint256 amountA,
		uint256 reserveA,
		uint256 reserveB
	) external pure returns (uint256 amountB);

	function getAmountOut(
		uint256 amountIn,
		uint256 reserveIn,
		uint256 reserveOut
	) external pure returns (uint256 amountOut);

	function getAmountIn(
		uint256 amountOut,
		uint256 reserveIn,
		uint256 reserveOut
	) external pure returns (uint256 amountIn);

	function getAmountsOut(uint256 amountIn, address[] calldata path) external view returns (uint256[] memory amounts);

	function getAmountsIn(uint256 amountOut, address[] calldata path) external view returns (uint256[] memory amounts);
}

interface IUniswapV2Router02 is IUniswapV2Router01 {
	function removeLiquidityETHSupportingFeeOnTransferTokens(
		address token,
		uint256 liquidity,
		uint256 amountTokenMin,
		uint256 amountETHMin,
		address to,
		uint256 deadline
	) external returns (uint256 amountETH);

	function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens(
		address token,
		uint256 liquidity,
		uint256 amountTokenMin,
		uint256 amountETHMin,
		address to,
		uint256 deadline,
		bool approveMax,
		uint8 v,
		bytes32 r,
		bytes32 s
	) external returns (uint256 amountETH);

	function swapExactTokensForTokensSupportingFeeOnTransferTokens(
		uint256 amountIn,
		uint256 amountOutMin,
		address[] calldata path,
		address to,
		uint256 deadline
	) external;

	function swapExactETHForTokensSupportingFeeOnTransferTokens(
		uint256 amountOutMin,
		address[] calldata path,
		address to,
		uint256 deadline
	) external payable;

	function swapExactTokensForETHSupportingFeeOnTransferTokens(
		uint256 amountIn,
		uint256 amountOutMin,
		address[] calldata path,
		address to,
		uint256 deadline
	) external;
}

contract DreverInu is ERC20, Ownable {
	using SafeMath for uint256;

	IUniswapV2Router02 public immutable uniswapV2Router;
	address public immutable uniswapV2Pair;
	address public constant deadAddress = address(0xdead);

	bool private swapping;

	address public marketingWallet;
	address public devWallet;

	uint256 public maxTransactionAmount;
	uint256 public swapTokensAtAmount;
	uint256 public maxWallet;

	uint256 public percentForLPBurn = 25; // 25 = .25%
	bool public lpBurnEnabled = true;
	uint256 public lpBurnFrequency = 3600 seconds;
	uint256 public lastLpBurnTime;

	uint256 public manualBurnFrequency = 30 minutes;
	uint256 public lastManualLpBurnTime;

	bool public limitsInEffect = true;
	bool public tradingActive = false;
	bool public swapEnabled = false;

	// Anti-bot and anti-whale mappings and variables
	mapping(address => uint256) private _holderLastTransferTimestamp; // to hold last Transfers temporarily during launch
	bool public transferDelayEnabled = true;

	uint256 public buyTotalFees;
	uint256 public buyMarketingFee;
	uint256 public buyLiquidityFee;
	uint256 public buyDevFee;

	uint256 public sellTotalFees;
	uint256 public sellMarketingFee;
	uint256 public sellLiquidityFee;
	uint256 public sellDevFee;

	uint256 public tokensForMarketing;
	uint256 public tokensForLiquidity;
	uint256 public tokensForDev;

	/******************/

	// exlcude from fees and max transaction amount
	mapping(address => bool) private _isExcludedFromFees;
	mapping(address => bool) public _isExcludedMaxTransactionAmount;

	// store addresses that a automatic market maker pairs. Any transfer *to* these addresses
	// could be subject to a maximum transfer amount
	mapping(address => bool) public automatedMarketMakerPairs;

	event UpdateUniswapV2Router(address indexed newAddress, address indexed oldAddress);

	event ExcludeFromFees(address indexed account, bool isExcluded);

	event SetAutomatedMarketMakerPair(address indexed pair, bool indexed value);

	event marketingWalletUpdated(address indexed newWallet, address indexed oldWallet);

	event devWalletUpdated(address indexed newWallet, address indexed oldWallet);

	event SwapAndLiquify(uint256 tokensSwapped, uint256 ethReceived, uint256 tokensIntoLiquidity);

	event AutoNukeLP();

	event ManualNukeLP();

	constructor() ERC20("Drever Inu", "DreverInu") {
		IUniswapV2Router02 _uniswapV2Router = IUniswapV2Router02(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);

		excludeFromMaxTransaction(address(_uniswapV2Router), true);
		uniswapV2Router = _uniswapV2Router;

		uniswapV2Pair = IUniswapV2Factory(_uniswapV2Router.factory()).createPair(address(this), _uniswapV2Router.WETH());
		excludeFromMaxTransaction(address(uniswapV2Pair), true);
		_setAutomatedMarketMakerPair(address(uniswapV2Pair), true);

		uint256 _buyMarketingFee = 4;
		uint256 _buyLiquidityFee = 10;
		uint256 _buyDevFee = 1;

		uint256 _sellMarketingFee = 5;
		uint256 _sellLiquidityFee = 14;
		uint256 _sellDevFee = 1;

		uint256 totalSupply = 1 * 1e12 * 1e18;

		//maxTransactionAmount = totalSupply * 1 / 1000; // 0.1% maxTransactionAmountTxn
		maxTransactionAmount = totalSupply;
		maxWallet = totalSupply; // .5% maxWallet
		swapTokensAtAmount = (totalSupply * 5) / 10000; // 0.05% swap wallet

		buyMarketingFee = _buyMarketingFee;
		buyLiquidityFee = _buyLiquidityFee;
		buyDevFee = _buyDevFee;
		buyTotalFees = buyMarketingFee + buyLiquidityFee + buyDevFee;

		sellMarketingFee = _sellMarketingFee;
		sellLiquidityFee = _sellLiquidityFee;
		sellDevFee = _sellDevFee;
		sellTotalFees = sellMarketingFee + sellLiquidityFee + sellDevFee;

		marketingWallet = address(owner()); // set as marketing wallet
		devWallet = address(owner()); // set as dev wallet

		// exclude from paying fees or having max transaction amount
		excludeFromFees(owner(), true);
		excludeFromFees(address(this), true);
		excludeFromFees(address(0xdead), true);

		excludeFromMaxTransaction(owner(), true);
		excludeFromMaxTransaction(address(this), true);
		excludeFromMaxTransaction(address(0xdead), true);

		/*
            _mint is an internal function in ERC20.sol that is only called here,
            and CANNOT be called ever again
        */
		_mint(msg.sender, totalSupply);
	}

	receive() external payable {}

	// once enabled, can never be turned off
	function enableTrading() external onlyOwner {
		tradingActive = true;
		swapEnabled = true;
		lastLpBurnTime = block.timestamp;
	}

	// remove limits after token is stable
	function removeLimits() external onlyOwner returns (bool) {
		limitsInEffect = false;
		return true;
	}

	// disable Transfer delay - cannot be reenabled
	function disableTransferDelay() external onlyOwner returns (bool) {
		transferDelayEnabled = false;
		return true;
	}

	// change the minimum amount of tokens to sell from fees
	function updateSwapTokensAtAmount(uint256 newAmount) external onlyOwner returns (bool) {
		require(newAmount >= (totalSupply() * 1) / 100000, "Swap amount cannot be lower than 0.001% total supply.");
		require(newAmount <= (totalSupply() * 5) / 1000, "Swap amount cannot be higher than 0.5% total supply.");
		swapTokensAtAmount = newAmount;
		return true;
	}

	function updateMaxTxnAmount(uint256 newNum) external onlyOwner {
		require(newNum >= 0, "Cannot set maxTransactionAmount lower than 0%");
		maxTransactionAmount = newNum * (10**18);
	}

	function updateMaxWalletAmount(uint256 newNum) external onlyOwner {
		require(newNum >= ((totalSupply() * 5) / 1000) / 1e18, "Cannot set maxWallet lower than 0.5%");
		maxWallet = newNum * (10**18);
	}

	function excludeFromMaxTransaction(address updAds, bool isEx) public onlyOwner {
		_isExcludedMaxTransactionAmount[updAds] = isEx;
	}

	// only use to disable contract sales if absolutely necessary (emergency use only)
	function updateSwapEnabled(bool enabled) external onlyOwner {
		swapEnabled = enabled;
	}

	function updateBuyFees(
		uint256 _marketingFee,
		uint256 _liquidityFee,
		uint256 _devFee
	) external onlyOwner {
		buyMarketingFee = _marketingFee;
		buyLiquidityFee = _liquidityFee;
		buyDevFee = _devFee;
		buyTotalFees = buyMarketingFee + buyLiquidityFee + buyDevFee;
		require(buyTotalFees <= 20, "Must keep fees at 20% or less");
	}

	function updateSellFees(
		uint256 _marketingFee,
		uint256 _liquidityFee,
		uint256 _devFee
	) external onlyOwner {
		sellMarketingFee = _marketingFee;
		sellLiquidityFee = _liquidityFee;
		sellDevFee = _devFee;
		sellTotalFees = sellMarketingFee + sellLiquidityFee + sellDevFee;
		require(sellTotalFees <= 25, "Must keep fees at 25% or less");
	}

	function excludeFromFees(address account, bool excluded) public onlyOwner {
		_isExcludedFromFees[account] = excluded;
		emit ExcludeFromFees(account, excluded);
	}

	function setAutomatedMarketMakerPair(address pair, bool value) public onlyOwner {
		require(pair != uniswapV2Pair, "The pair cannot be removed from automatedMarketMakerPairs");

		_setAutomatedMarketMakerPair(pair, value);
	}

	function _setAutomatedMarketMakerPair(address pair, bool value) private {
		automatedMarketMakerPairs[pair] = value;

		emit SetAutomatedMarketMakerPair(pair, value);
	}

	function updateMarketingWallet(address newMarketingWallet) external onlyOwner {
		emit marketingWalletUpdated(newMarketingWallet, marketingWallet);
		marketingWallet = newMarketingWallet;
	}

	function updateDevWallet(address newWallet) external onlyOwner {
		emit devWalletUpdated(newWallet, devWallet);
		devWallet = newWallet;
	}

	function isExcludedFromFees(address account) public view returns (bool) {
		return _isExcludedFromFees[account];
	}

	event BoughtEarly(address indexed sniper);

	function _transfer(
		address from,
		address to,
		uint256 amount
	) internal override {
		require(from != address(0), "ERC20: transfer from the zero address");
		require(to != address(0), "ERC20: transfer to the zero address");

		if (amount == 0) {
			super._transfer(from, to, 0);
			return;
		}

		if (limitsInEffect) {
			if (from != owner() && to != owner() && to != address(0) && to != address(0xdead) && !swapping) {
				if (!tradingActive) {
					require(_isExcludedFromFees[from] || _isExcludedFromFees[to], "Trading is not active.");
				}

				// at launch if the transfer delay is enabled, ensure the block timestamps for purchasers is set -- during launch.
				if (transferDelayEnabled) {
					if (to != owner() && to != address(uniswapV2Router) && to != address(uniswapV2Pair)) {
						require(_holderLastTransferTimestamp[tx.origin] < block.number, "_transfer:: Transfer Delay enabled.  Only one purchase per block allowed.");
						_holderLastTransferTimestamp[tx.origin] = block.number;
					}
				}

				//when buy
				if (automatedMarketMakerPairs[from] && !_isExcludedMaxTransactionAmount[to]) {
					require(amount <= maxTransactionAmount, "Buy transfer amount exceeds the maxTransactionAmount.");
					require(amount + balanceOf(to) <= maxWallet, "Max wallet exceeded");
				}
				//when sell
				else if (automatedMarketMakerPairs[to] && !_isExcludedMaxTransactionAmount[from]) {
					require(amount <= maxTransactionAmount, "Sell transfer amount exceeds the maxTransactionAmount.");
				} else if (!_isExcludedMaxTransactionAmount[to]) {
					require(amount + balanceOf(to) <= maxWallet, "Max wallet exceeded");
				}
			}
		}

		uint256 contractTokenBalance = balanceOf(address(this));

		bool canSwap = contractTokenBalance >= swapTokensAtAmount;

		if (canSwap && swapEnabled && !swapping && !automatedMarketMakerPairs[from] && !_isExcludedFromFees[from] && !_isExcludedFromFees[to]) {
			swapping = true;

			swapBack();

			swapping = false;
		}

		if (!swapping && automatedMarketMakerPairs[to] && lpBurnEnabled && block.timestamp >= lastLpBurnTime + lpBurnFrequency && !_isExcludedFromFees[from]) {
			autoBurnLiquidityPairTokens();
		}

		bool takeFee = !swapping;

		// if any account belongs to _isExcludedFromFee account then remove the fee
		if (_isExcludedFromFees[from] || _isExcludedFromFees[to]) {
			takeFee = false;
		}

		uint256 fees = 0;
		// only take fees on buys/sells, do not take on wallet transfers
		if (takeFee) {
			// on sell
			if (automatedMarketMakerPairs[to] && sellTotalFees > 0) {
				fees = amount.mul(sellTotalFees).div(100);
				tokensForLiquidity += (fees * sellLiquidityFee) / sellTotalFees;
				tokensForDev += (fees * sellDevFee) / sellTotalFees;
				tokensForMarketing += (fees * sellMarketingFee) / sellTotalFees;
			}
			// on buy
			else if (automatedMarketMakerPairs[from] && buyTotalFees > 0) {
				fees = amount.mul(buyTotalFees).div(100);
				tokensForLiquidity += (fees * buyLiquidityFee) / buyTotalFees;
				tokensForDev += (fees * buyDevFee) / buyTotalFees;
				tokensForMarketing += (fees * buyMarketingFee) / buyTotalFees;
			}

			if (fees > 0) {
				super._transfer(from, address(this), fees);
			}

			amount -= fees;
		}

		super._transfer(from, to, amount);
	}

	function swapTokensForEth(uint256 tokenAmount) private {
		// generate the uniswap pair path of token -> weth
		address[] memory path = new address[](2);
		path[0] = address(this);
		path[1] = uniswapV2Router.WETH();

		_approve(address(this), address(uniswapV2Router), tokenAmount);

		// make the swap
		uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(
			tokenAmount,
			0, // accept any amount of ETH
			path,
			address(this),
			block.timestamp
		);
	}

	function addLiquidity(uint256 tokenAmount, uint256 ethAmount) private {
		// approve token transfer to cover all possible scenarios
		_approve(address(this), address(uniswapV2Router), tokenAmount);

		// add the liquidity
		uniswapV2Router.addLiquidityETH{ value: ethAmount }(
			address(this),
			tokenAmount,
			0, // slippage is unavoidable
			0, // slippage is unavoidable
			deadAddress,
			block.timestamp
		);
	}

	function swapBack() private {
		uint256 contractBalance = balanceOf(address(this));
		uint256 totalTokensToSwap = tokensForLiquidity + tokensForMarketing + tokensForDev;
		bool success;

		if (contractBalance == 0 || totalTokensToSwap == 0) {
			return;
		}

		if (contractBalance > swapTokensAtAmount * 20) {
			contractBalance = swapTokensAtAmount * 20;
		}

		// Halve the amount of liquidity tokens
		uint256 liquidityTokens = (contractBalance * tokensForLiquidity) / totalTokensToSwap / 2;
		uint256 amountToSwapForETH = contractBalance.sub(liquidityTokens);

		uint256 initialETHBalance = address(this).balance;

		swapTokensForEth(amountToSwapForETH);

		uint256 ethBalance = address(this).balance.sub(initialETHBalance);

		uint256 ethForMarketing = ethBalance.mul(tokensForMarketing).div(totalTokensToSwap);
		uint256 ethForDev = ethBalance.mul(tokensForDev).div(totalTokensToSwap);

		uint256 ethForLiquidity = ethBalance - ethForMarketing - ethForDev;

		tokensForLiquidity = 0;
		tokensForMarketing = 0;
		tokensForDev = 0;

		(success, ) = address(devWallet).call{ value: ethForDev }("");

		if (liquidityTokens > 0 && ethForLiquidity > 0) {
			addLiquidity(liquidityTokens, ethForLiquidity);
			emit SwapAndLiquify(amountToSwapForETH, ethForLiquidity, tokensForLiquidity);
		}

		(success, ) = address(marketingWallet).call{ value: address(this).balance }("");
	}

	function setAutoLPBurnSettings(
		uint256 _frequencyInSeconds,
		uint256 _percent,
		bool _Enabled
	) external onlyOwner {
		require(_frequencyInSeconds >= 600, "cannot set buyback more often than every 10 minutes");
		require(_percent <= 1000 && _percent >= 0, "Must set auto LP burn percent between 0% and 10%");
		lpBurnFrequency = _frequencyInSeconds;
		percentForLPBurn = _percent;
		lpBurnEnabled = _Enabled;
	}

	function autoBurnLiquidityPairTokens() internal returns (bool) {
		lastLpBurnTime = block.timestamp;

		// get balance of liquidity pair
		uint256 liquidityPairBalance = this.balanceOf(uniswapV2Pair);

		// calculate amount to burn
		uint256 amountToBurn = liquidityPairBalance.mul(percentForLPBurn).div(10000);

		// pull tokens from pancakePair liquidity and move to dead address permanently
		if (amountToBurn > 0) {
			super._transfer(uniswapV2Pair, address(0xdead), amountToBurn);
		}

		//sync price since this is not in a swap transaction!
		IUniswapV2Pair pair = IUniswapV2Pair(uniswapV2Pair);
		pair.sync();
		emit AutoNukeLP();
		return true;
	}

	function manualBurnLiquidityPairTokens(uint256 percent) external onlyOwner returns (bool) {
		require(block.timestamp > lastManualLpBurnTime + manualBurnFrequency, "Must wait for cooldown to finish");
		require(percent <= 1000, "May not nuke more than 10% of tokens in LP");
		lastManualLpBurnTime = block.timestamp;

		// get balance of liquidity pair
		uint256 liquidityPairBalance = this.balanceOf(uniswapV2Pair);

		// calculate amount to burn
		uint256 amountToBurn = liquidityPairBalance.mul(percent).div(10000);

		// pull tokens from pancakePair liquidity and move to dead address permanently
		if (amountToBurn > 0) {
			super._transfer(uniswapV2Pair, address(0xdead), amountToBurn);
		}

		//sync price since this is not in a swap transaction!
		IUniswapV2Pair pair = IUniswapV2Pair(uniswapV2Pair);
		pair.sync();
		emit ManualNukeLP();
		return true;
	}
}