pragma solidity ^0.4.0;
contract StipendiEqui {

    address[] employees = [0xb15F058DfeBD2C517d330dA9Cb5Ad088dCA2D958, 0xE25d9dFC9f4E9f7031F68F4ADf3643151c953185, 0x583031d1113ad414f02576bd6afabfb302140225];
    uint totalReceived = 0;
    mapping (address => uint) listaPrelievi;

    function StipendiEqui() payable {
        updateTotalReceived();
    }

    function () payable{
        updateTotalReceived();
    }

    function updateTotalReceived() internal {
        totalReceived += msg.value;
    }

    modifier puoPrelevare(){
        bool contains = false;

        for (uint i = 0; i < employees.length; i++){
            if(employees[i] == msg.sender){
                contains = true;
            }
        }

        require(contains);
        _;
    }

    function preleva() puoPrelevare {
        uint soldiPerOgniDipedente = totalReceived/employees.length;
        uint soldiPresi = listaPrelievi[msg.sender];
        uint soldi = soldiPerOgniDipedente - soldiPresi;
        listaPrelievi[msg.sender] = soldiPresi + soldi;

        if(soldi > 0)
        {
            msg.sender.transfer(soldi);
        }
    }

}