#include <iostream>
#include <vector>

using namespace std;
typedef long double ld;

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