#include<bits/stdc++.h>
using namespace std;
int main(){
    int a, b; cin >> a >> b;
    int x1 = min(a,b);
    int x2 = (a+b)/4;
    int x3 = (a+b+3)/4;
    int ans = abs(a+b-4*x1);
    if (x2 <= x1){
        ans = min(ans,abs(a+b-4*x2));
    }
    if (x3 <= x1){
        ans = min(ans,abs(a+b-4*x3));
    }
    cout << ans << endl;
}