#include <iostream>

using namespace std;

int n, m;

int findans(int n, int m) {

if (n == 0) return m;

if (m == 0) return n % 3;

return findans(n - 1, m) - findans(n, m - 1) + findans(n -

1, m - 1);

}

int main(){

cin >> n >> m;

cout << findans(n, m) << endl;

return 0;

}

输入：5 6

输出：_________