#include <stdio.h>
#include <math.h>

long fact(long i,long m) {
 long sum = 1;
 if (!i)
	 i = 1;
 if (!m)
	 m = 1;

 while (i >= m)
	 sum *= i--;

 return sum;
}

int main(void) {
	long n,k,x,p,c,s=0;



	while(scanf("%d %d",&n,&k) != EOF){
/*	scanf("%d %d",&n,&k);*/
		c=0;
/*		printf("%ld %ld\n", fact(n,k+1), fact(n-k,1));*/
		x=fact(n,k+1) / fact(n-k,1);
		s=(long)(sqrt(x));
		for (p=1; p<=s; p++)
			if (!(x%p)) c+=2;
		if (x==(s*s)) c--;


/*		printf("%d\n",x);
		printf("%d\n",s);*/
		printf("%d\n",c);
	}
	return 0;
}