//#include <bits/stdc++.h>
#include <iostream>
#include <fstream>
#include <vector>
#include <string>
#include <cmath>
#include <algorithm>
#include <map>
#include <iomanip>
#include <stdlib.h>
#include <stdio.h>
#include <queue>
#include <deque>
#include <set>
#include <stack>
#include <time.h>
 
using namespace std;
 
typedef long long ll;
typedef long double ld;
typedef pair<int, int> Pii;
typedef pair<int, ll> Pil;
typedef pair<ll, ll> Pll;
typedef pair<ll, int> Pli;
 
const ll MOD = 1e9 + 7;
const ll MOD2 = 998244353;
const ll INF = 1ll << 60;
const double PI = 2 * asin(1);

int main(){
  int D1, D2; cin >> D1 >> D2;

  if (2 * D1 == D2 || D1 == D2){
    cout << 4 << endl;
  }else if (D1 < D2 && D2 < 2 * D1){
    cout << 8 << endl;
  }else{
    cout << 0 << endl;
  }

  return 0;
}