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

#define MAX 431

int n,k;
int divis[MAX+5];

void f(int num,int delta) {
  int p=2;
  while (num>1) {
    while ((num%p) == 0) {
      divis[p]+=delta;
      num/=p;
    }

    p++;
  }
}

int main(void) {
  while (n=-1, scanf("%d %d",&n, &k), n!=-1) {
    memset(divis,0,sizeof(divis));

    for (int i=1;i<=n;i++) f(i,1);
    for (int i=1;i<=k;i++) f(i,-1);
    for (int i=1;i<=n-k;i++) f(i,-1);

    unsigned long long sum=1;
    for (int i=2;i<=MAX;i++) sum*=(unsigned long long)((divis[i]+1));

    printf("%llu\n",sum);
  }

  return 0;
}