#include <stdio.h>

int main()
{
	int m, n, i, p = 1;

	printf("m=\n");
	scanf("%d", &m);
	printf("n=\n");
	scanf("%d", &n);
	for (i = m - n + 1; i <= m; i++) {
		p *= i;
	}
	printf("p=%d\n", p);
	return 0;
}