#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (n); i++)
#define ALL(v) (v).begin(), (v).end()
using ll = long long;
using P = pair<int, int>;
constexpr int INF = 1e9;
constexpr long long LINF = 1e18;
constexpr long long MOD = 1e9 + 7;

signed main() {
    int d[2];
    cin >> d[0] >> d[1];
    if(d[0] * 2 < d[1]){
        cout << 0 << endl;
    }else if(d[0] * 2 == d[1]){
        cout << 4 << endl;
    }else if(d[0] < d[1]){
        cout << 8 << endl;
    }else if(d[0] == d[1]){
        cout << 4 << endl;
    }else{
        cout << 0 << endl;
    }
    return 0;
}