Blockchain 3

pragma solidity ^0.4.0;

contract SimpleStorage{

    uint a;

    uint shop_1=0;

    uint shop_2=0;

    function initial( uint balu)public{

        a = balu;

    }

     function Shop1( uint balu)public{

        a = a-balu;

        shop_1=shop_1+balu;

    }

     function Shop2(uint balu)public{

          a = a-balu;

          shop_2=shop_2+balu;

    }

     function add(uint balu)public{

          a = a+balu;

    }

    function balance()public constant returns(uint){

        return a;

    }

     function shop_1balance()public constant returns(uint){

        return shop_1;

    } function shop_2balance()public constant returns(uint){

        return shop_2;

    }

    

}