#include<bits/stdc++.h>
using namespace std;
using ll = long long;
#define rep(i,m,n) for(int i=m; i<n; ++i)
#define repl(i,m,n) for(ll i=m; i<n; ++i)

int main(){
    int D1, D2;
    cin >> D1 >> D2;

    if(D2 < D1){
        cout << 0 << endl;
    }else if(D2 == D1){
        cout << 4 << endl;
    }else if(D2 < 2*D1){
        cout << 8 << endl;
    }else if(D2 == 2*D1){
        cout << 4 << endl;
    }else{
        cout << 0 << endl;
    }

    return 0;
}