#include <iostream>
#include <cmath>
#include <queue>
#include <cassert>
using namespace std; typedef long long ll;

int main() {
  int d1,d2; cin>>d1>>d2;
  if (d1>d2) {
    cout<<0<<endl;
  } else if (d1==d2){
    cout<<4<<endl;
  } else {
    if (d2<2*d1) cout<<8<<endl;
    else if (d2==2*d1) cout<<4<<endl;
    else cout<<0<<endl;
  }
}