An accountant receives a salary of $306,000 per year. During the year, he plans to spend $101,500 on his mortgage, $63,000 on food, $48,900 on clothing, $43,000 on household expenses, and $37,000 on other expenses. With the money he has left, he expects to buy as many shares of stock at $280 per share as possible. How many shares will he be able to buy?