Arranging Books on a Shelf

The window display at Whetcode Books has a row of slots, and a shortlist of new titles is in the running. Position is part of the display: the designer treats the same titles read left to right in a different sequence as a different window, and no title can appear in two slots at once. Any titles she does not use stay in the stockroom.

She redresses the window every month with a different shortlist and a different number of slots, and she wants the size of the space she is choosing from before she starts photographing options.

Task: Print how many distinct windows can be built from the shortlist, as a single integer.

Input

The first line holds how many titles are on the shortlist, a whole number of at least 1. The second line holds how many slots the window has, a whole number between 1 and the number of titles.

Output

One line holding the number of distinct windows, as a plain integer - 360, never 360.0.

Example:

Input:
6
4

Output:
360