C++ :

#include <bits/stdc++.h>
using namespace std;

int m, n;
int f[109][109];

int main() {
	while (cin >> m >> n) {
		for (int i = 0; i <= m; i ++) {
			f[i][0] = 1;
			for (int j = 1; j <= i; j ++) {
				f[i][j] = f[i - 1][j] + f[i - 1][j - 1];
			}
		}
	
		cout << f[m][n] << endl;
	}

	return 0;
}