On the day his son was born, the father made decision to establish the fund for the son's college education. Father wishes son to be able to withdraw $4000 from fund on the 18th birthday, again on the 19th birthday, again on the 20th birthday, and also on 21st birthday. If fund earns interest at 9% per year, compounded annually, how much must father deposit at end of every year, up through 17th year?