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

int n, k;
unsigned long int number;
unsigned long int faktorial(int f)
{
	unsigned long int number = 1;
	for (int i = 1; i <= f; i++)
	{
		number *= i;
	}
	return number;
}
int del()
{
	if (number == 0)
		return 0;

	if (number == 1)
		return 1;
	
	int found = 2;
	for (unsigned long int i = 2; i <= (unsigned long int)(number/2) ; i++)
	{
		if ((number % i) == 0)
		{found++;
		//	printf("%ld %d\n", number, i);
		}
	}
	return found;
}

int main(void)
{
	while (scanf("%d %d", &n, &k) == 2)
	{
		if (k > (int)(n /2))
		{
			k = n-k;
		}
		
		number = 1;
		for (int i = 1; i <= k ; i++)
		{
			number *= n-i+1;
		}
//		printf("%d %d %ld\n", n, k, number);
		number = (unsigned long int)(number / faktorial(k));
//		printf("n%d k%d k!%ld %lu\n", n, k, faktorial(k), number);
//		printf("%d %d %ld: %ld\n", n, k, number, del());
		printf("%d\n", del());
	}
	return 0;
}