#include <bits/stdc++.h>
using namespace std;
using ll=long long;
using Graph=vector<vector<pair<int,int>>>;
#define INF 1000000000000000000
#define MOD 1000000007

int main(){
  int D1,D2;
  cin>>D1>>D2;
  if(2*D1<D2){
    cout<<0<<endl;
  }else if(2*D1==D2){
    cout<<4<<endl;
  }else if(D1<D2){
    cout<<8<<endl;
  }else if(D1==D2){
    cout<<4<<endl;
  }else{
    cout<<0<<endl;
  }
}