#include <bits/stdc++.h>
using namespace std;

#define int long long
template<class T>bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; }
template<class T>bool chmin(T &a, const T &b) { if (b<a) { a=b; return 1; } return 0; }

signed main(){
	int a, b;
	cin >> a >> b;

	if(a*4 < b*2 || b < a){
		cout << 0 << endl;
	}else if(a*4 == b*2 || b == a){
		cout << 4 << endl;
	}else{
		cout << 8 << endl;
	}

	return 0;
}