#include <bits/stdc++.h>
#define rep(i,n) for(int i=0;i<n;i++)
using namespace std;
using ll = long long ;
using P = pair<int,int> ;
const int INF = 1e9;
const int 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(d2 ==d1) cout << 4 << endl;
    else if(d2 < d1) cout << 0 << endl;
    else cout << 8 << endl;
    return 0;
}