FinalDecision.sol

pragma solidity ^0.4.24;

contract FinalDecision {
    
    mapping (uint => bool) alreadyDrawed;
    uint public drawed;
    uint[] public teams;
    
    function rand() public{
        uint _team = uint(keccak256(now)) % 7 + 1;
        uint flag = 0;
        while(alreadyDrawed[_team]){
            flag++;
            _team = uint(keccak256(now+flag)) % 7 + 1;
        }
        alreadyDrawed[_team] = true;
        drawed++;
        
        teams.push(_team);
    }
    
}