#include <iostream>

using namespace std;

int Ack(int m, int n);

int main() {
     cout << Ack(1,2) << endl;
     return 0;
}

int Ack(int m, int n) {
    //cout <<"\tEvaluating " << m << " " << n << endl;
    if (m == 0) {
        return n+1;
    }
    if (n == 0) {
        return Ack(m-1,1);
    }
    return Ack(m-1,Ack(m,n-1));
}