You need $$7000$ per year for four years to go to college. Your father invested $$10000$ in an account at $7\%,$ compounded annually, for your education when you were born. If you withdraw the $$7000$ at the end of your $17$th$,18$th$,19$th$,$ and $20$th years, how much money will be left in the account at the end of your $21$st year?