#include <iostream>
#include<math.h>
using namespace std;
int main(){
  int d1,d2;
  cin >> d1 >> d2;
  if(d1>d2) cout << 0 << endl;
  else if(d1==d2) cout << 4 << endl;
  else if(2*d1>d2) cout << 8 << endl;
  else if(2*d1==d2) cout << 4 << endl;
  else cout << 0 << endl;
}