#include <iostream>

using namespace std;

#define repd(i,a,b) for (int i=(a);i<(b);++i)
#define rep(i,n) repd(i,0,n)
typedef long long ll;


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 << 4 << endl;
  }else if(d2 / 2 > d1){
    cout << 0 << endl;
  }else{
    cout << 8 << endl;
  }

  return 0;
}