#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
#define MOD 1000000007
#define INF 1LL<<30
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define all(x) (x).begin(),(x).end()

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;

}