#include <stdio.h>

int perm(int m, int n)
{
	if(m<n) {printf("No solution\n"); exit(0);}
	if(m==n) return(1);
	else return(perm(m-1,n));
}

main()
{
	int m, n;

	printf("Input two integers:\n");
	scanf("%d %d", &m, &n);
	printf("Permutation(%d, %d)=%d", m, n, perm(m,n));
}