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// contracts/Funding.sol
pragma solidity ^0.4.17;

contract Funding {
  uint public raised;
  uint public finishesAt;
  address public owner;
  mapping(address => uint) public balances;

  function Funding(uint _duration) public {
    owner = msg.sender;
    finishesAt = now + _duration;
  }

  function isFinished() public view returns (bool) {
    return finishesAt <= now;
  }

  function donate() public payable {
    balances[msg.sender] += msg.value;
    raised += msg.value;
  }
}