#include<bits/stdc++.h>
#include<iostream>
#include<unordered_set>
#include<unordered_map>
using namespace std;
#define int long long
#define REP(i,m,n) for(int i=(m);i<(n);i++)
#define rep(i,n) REP(i,0,n)
#define pb push_back
#define all(a) a.begin(),a.end()
#define rall(c) (c).rbegin(),(c).rend()
#define mp make_pair
#define endl '\n'
typedef long long ll;
typedef pair<ll,ll> pll;
typedef long double ld;
const ll inf=1e9+7;
const ll mod=998244353;
signed main(){
    cin.tie(0);
    ios::sync_with_stdio(false);
    ll a,b;cin>>a>>b;
    if(a<b&&a*2>b)cout<<8<<endl;
    if(a*2==b)cout<<4<<endl;
    if(a==b)cout<<4<<endl;
    if(a>b)cout<<0<<endl;
    if(a*2<b)cout<<0<<endl;
}