#include <bits/stdc++.h>
using namespace std;
#define modulo 1000000007
#define mod(mod_x) ((((long long)mod_x)+modulo)%modulo)
#define Inf 1000000000


int main() {
	
	int D1,D2;
	cin>>D1>>D2;
	
	if(D1==D2){
		cout<<4<<endl;
		return 0;
	}
	
	if(D1>D2){
		cout<<0<<endl;
		return 0;
	}
	else{
		if(D2==D1*2){
			cout<<4<<endl;
			return 0;
		}
		else if(D2>D1*2){
			cout<<0<<endl;
		}
		else{
			cout<<8<<endl;
		}
	}
	
    return 0;
}