#include <bits/stdc++.h>

using namespace std;

int main() {
    int x, y;
    cin >> x >> y;
    
    int ans;
    if (x == y) {
        ans = 0;
    } else if (x == -y) {
        ans = 3;
    } else if (y == 0) {
        ans = 1;
    } else if (x == 0) {
        ans = 2;
    } else {
        ans = -1;
    }

    cout << ans << endl;
    return 0;
}