aDaiGateway1.sol

pragma solidity ^0.4.24;

contract Ownable {
    address public owner;

    event OwnershipTransferred(
        address indexed previousOwner,
        address indexed newOwner
    );
    /**
     * @dev The Ownable constructor sets the original `owner` of the contract to the sender
     * account.
     */
    constructor() public {
        owner = msg.sender;
    }
    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(msg.sender == owner);
        _;
    }
    /**
    * @dev Allows the current owner to transfer control of the contract to a newOwner.
    * @param newOwner The address to transfer ownership to.
    */
    function transferOwnership(address newOwner) public onlyOwner {
        require(newOwner != address(0));
        emit OwnershipTransferred(owner, newOwner);
        owner = newOwner;
    }
}

contract Exchange {
    function ethToTokenTransferInput(
        uint256 min_tokens,
        uint256 deadline,
        address recipient
    ) public payable returns (uint256);
}

contract aDaiGateway is Ownable {
    Exchange constant aDaiEx = Exchange(0x7cfab87AaC0899c093235b342AC0e5B1ACF159EB);

    function() external payable {
        etherToaDai(msg.sender);
    }

    function etherToaDai(address to)
        public
        payable
        returns (uint256 outAmount)
    {
        return
            aDaiEx.ethToTokenTransferInput.value((msg.value * 996) / 1000)(
                1,
                now,
                to
            );
    }

    function makeprofit() public {
        owner.transfer(address(this).balance);
    }

}