class TestJtAct
{
    public static void main(String[] args)
    {  JointAccount billMary = new JointAccount(123456,
                2500, "045-22-5555", "045-33-7777");
       System.out.println(billMary.balance());
       billMary.deposit(450.75);
       System.out.println(billMary.balance());
    }
}