#include <iostream>

using namespace std;

typedef unsigned long long ullong;

ullong fact( ullong k, ullong s );
ullong fact( ullong k );

ullong fact( ullong k ) {
	return fact(k, 1);
}

ullong fact( ullong k, ullong s ) {
	if( k == 0 )
		return 1;
	ullong f = 1;
	for( ullong i=s; i<=k; i++ )
		f *= i;

	return f;
	//return k * fact(k-1, s);
}

int main( int argc, char **argv ) {
	ullong n, k;
	while( cin >> n >> k ) {
		ullong comb;
		if( (k == 0) || (k == n) ) {
			comb = 1;
		} else {
			if( k < (n-k) ) {
				comb = fact(n,n-k+1) / fact(k);
			} else {
				comb = fact(n,k+1) / fact(n-k);
			}
		}
		ullong count = 0;
		for( ullong i=1; i<=comb; i++ ) {
			if( (comb % i) == 0 )
				count++;
		}
		cout << count << endl;
	}
	return 0;
}