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

int w(int m, int n) {
	int a = 0;
	if (m = 0) {
		a = n + 1;
	} else if (m > 0 && n = 0) {
		a = w(m - 1, 1);
	} else {
		a = w(m - 1, w(m, n - 1);
	}
	    return a;
}

int main() {
	int m, n;
	cin >> m >> n;
	int l = w(m, n);
	cout << l;
	return 0;
}