A company manufactures x units of product A and y units of product B, on two machines, I and II. It has been determined that the company will realize a profit of $2 on each unit of product A and $5 on each unit of product B. To manufacture a unit of product A requires 5 min on machine I and 3 min on machine II. To manufacture a unit of product B requires 9 min on machine I and 4 min on machine II. There are 95 min available on machine I and 57 min available on machine II in each work shift. How many units of a product should be produced in each shift to maximize the company's profit P?