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

int main(){
    int x, y;
    cin >> x >> y;

    int rook_moves = 0;
    if (x == 0 && y == 0) {
        rook_moves = 0;
    } else if (x == 0 || y == 0) {
        rook_moves = 1;
    } else {
        rook_moves = 2;
    }

    int bishop_moves = 1e9;
    if (x == 0 && y == 0) {
        bishop_moves = 0;
    } else if (x == y || x == -y) {
        bishop_moves = 1;
    } else if ((x + y) % 2 == 0) {
        bishop_moves = 2;
    }

    cout << min(rook_moves, bishop_moves) << endl;
}