#include <bits/stdc++.h>

using namespace std;

void solve(){
    int a, b;
    cin >> a >> b;
    int same = 2*(min(a, b));
    int diff = abs(b- a);
    if(same <= diff){
        cout << diff << "\n";
    }else{
        int ans = (same - diff)%4;
        cout << min(4 - ans, ans) << "\n";
    }
}


int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    // int t;
    // cin >> t;
    // while(t--){
    //    solve();     
    // }
    solve();
    return 0;
}