Vadim prepared N perfect sandwiches, and M guests came to him, and all of them were hungry, and all are ready to eat any number of sandwiches (even zero) that Vadim gives them. To avoid upsetting anyone, each guest must be given the same number of sandwiches, and this number should be as large as possible, while the remaining sandwiches will have to be thrown away.

It is known that one perfect sandwich weighs 80 grams, and the crumbs left after eating one sandwich weigh 2 grams (of course, after each guest they also have to be thrown away). How many grams will Vadim have to throw away?

The first line contains an integer N — the number of prepared perfect sandwiches (1 ≤ N ≤ 10⁹).

The second line contains an integer M — the number of guests who came (1 ≤ M ≤ 10⁹).

Print the number of grams that Vadim will have to throw away.