#include <iostream>
#include <algorithm>
#include <cmath>

int main() {
    int a, b;
    std::cin >> a >> b;
    if (a > b) {
        std::swap(a, b);
    }

    int min = a + b;
    for (int i = 0; i <= a; i++) {
        min = std::min(min, abs(4 * i - (a + b)));
    }
    std::cout << min << '\n';
}