#include <iostream>
#define ll long long
using namespace std;
const int inf = 1073741823;


int main() {
    ll gx, gy;
    cin >> gx >> gy;

    int rook, bishop;

    if (gx == 0 && gy == 0) {
        rook = 0;
    } else if (gx == 0 || gy == 0) {
        rook = 1;
    } else {
        rook = 2;
    }

    if (gx == 0 && gy == 0) {
        bishop = 0;
    } else if (gx + gy == 0 || gx - gy == 0) {
        bishop = 1;
    } else if ((gx + gy) % 2 == 0) {
        bishop = 2;
    } else {
        bishop = inf;
    }

    cout << min(rook, bishop) << endl;
}