#include <iostream>
#include <vector>

using namespace std;
typedef long double ld;

int main() {
    int a, b;
    cin >> a >> b;
    if (2 * a > b)cout << 8 << endl;
    else if (2 * a == b)cout << 4 << endl;
    else cout << 0 << endl;
    return 0;
}