#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <ctype.h>

#define N 500

int f[N][N];

void add(int p[], int q[])
{
	int i;
	for (i = 0; i < N; i++) {
		p[i] += q[i];
	}
}
void sub(int p[], int q[])
{
	int i;
	for (i = 0; i < N; i++) {
		if (p[i] < q[i]) {
			fprintf(stderr,"BUUUUG %d %d %d\n",i,p[i],q[i]);
			exit(1);
		}
		p[i] -= q[i];
	}
}
typedef unsigned long long ull;

int main()
{
	int i, j, k, x, n;
	int p[N];
	ull d;

	for (i = 0; i < N; i++) {
		x = i;
		memset(f[i],0,sizeof(f[0]));
		for (j = 2; j <= i; j++) {
			while (x % j == 0) {
				x /= j;
				f[i][j]++;
			}
		}
	}
	while (scanf("%d%d",&n,&k) == 2)  {
			memset(p,0,sizeof(p));
			for (i = 2; i <= n; i++) {
				add(p,f[i]);
			}
			for (i = 2; i <= k; i++) {
				sub(p,f[i]);
			}
			for (i = 2; i <= (n-k); i++) {
				sub(p,f[i]);
			}
			d = 1ULL;
			for (i = 0; i < N; i++) {
				d = d*(p[i]+1);
			}
			printf("%llu\n",d);
	}

	return 0;
}