pragma solidity ^0.4.18;

contract EcoBtn {
    address private latestAddress;
    uint256 private latestBlock = 0;
    uint private amount = 0;
    
    uint public FIXED_AMOUNT_WEI = 1000000000000000000;

    constructor() public {
        latestBlock = block.number;
        latestAddress = msg.sender;
    }
    
    function claimTreasure() public{
        require(block.number - latestBlock >= 3);
        require(msg.sender == latestAddress);
        
        msg.sender.transfer(address(this).balance);
        amount = 0;
    }

    function pressBtn() public payable{
        require(msg.value >= FIXED_AMOUNT_WEI);
        
        msg.sender.transfer(msg.value-FIXED_AMOUNT_WEI);
        amount++;
        latestBlock = block.number;
    }
}