#include <bits/stdc++.h>
using namespace std;
int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    long long gx, gy;
    cin >> gx >> gy;

    // ルークの手数
    int rook;
    if (gx == 0 && gy == 0) {
        rook = 0;
    } else if (gx == 0 || gy == 0) {
        rook = 1;
    } else {
        rook = 2;
    }

    // ビショップの手数
    int bishop;
    if (gx == 0 && gy == 0) {
        bishop = 0;
    } else if (((gx + gy) & 1) != 0) {
        bishop = INT_MAX;  // 到達不可
    } else if (llabs(gx) == llabs(gy)) {
        bishop = 1;
    } else {
        bishop = 2;
    }

    // 答え
    int ans = min(rook, bishop);
    cout << ans << "\n";
    return 0;
}