#include <iostream>
using namespace std;

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

int main() {
	int m, n;
	cin >> m;
	cin >> n;
	cout <<ackermann(m, n)<<endl;
	return 0;
}