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

int main() {
    int X, Y, ans = -1;
    cin >> X >> Y;
   if(X == Y) ans = 0;
   else if(Y == 0) ans = 1;
   else if(X == 0) ans = 2;
   else if(X == -Y) ans = 3;
    cout << ans << '\n';
    return 0;
}