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

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    long long A, B;
    if (!(cin >> A >> B)) return 0;

    long long S = A + B;
    long long m = min(A, B);
    long long ans = LLONG_MAX;

    for (long long t = 0; t <= m; ++t) {
        long long diff = llabs(4*t - S);
        if (diff < ans) ans = diff;
    }

    cout << ans << "\n";
    return 0;
}