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

int main()
{
    int A, B;
    cin >> A >> B;
    int ans = 100;
    if (A > B)
    {
        swap(A, B);
    }
    for (int i = 0; i <= A; i++)
    {
        ans = min(ans, abs(A + B - 4 * i));
    }
    cout << ans << endl;
}