#include<bits/stdc++.h>
using namespace std;
int main(){
    int d1,d2;
    cin >> d1 >> d2;
    if(d1 == d2)cout << 4 << endl;
    else if(d1 > d2)cout << 0 << endl;
    else if(d1 > (double)d2/2)cout << 8 << endl;
    else if(d1 == (double)d2/2)cout<<4<<endl;
    else cout << 0 << endl;
}