#include <iostream>

unsigned long ackermann(int m, int n) {
	if (m==0)
		return n+1;
	if (n==0)
		return ackermann(m-1,1);
	return ackermann(m-1,ackermann(m,n-1));
}

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