#include <iostream>
#include <cmath>

int main() {
    int Gx, Gy;
    std::cin >> Gx >> Gy;

    int rook_moves = 2;
    if (Gx == 0 || Gy == 0) {
        rook_moves = 1;
    }

    int bishop_moves = -1;
    if (Gx % 2 == Gy % 2) {
        if (Gx == 0 && Gy == 0) {
            bishop_moves = 0;
        }
        else {
            bishop_moves = 1;
        }
    }

    if (bishop_moves == -1) {
        std::cout << rook_moves << std::endl;
    }
    else {
        std::cout << std::min(rook_moves, bishop_moves) << std::endl;
    }

    return 0;
}