#include <iostream> #include <vector> #include <string> #include <algorithm> #include <cstdio> #include <cstring> #include <cmath> using namespace std; int main() { int x, y; cin >> x >> y; int k = 0; if (x != y) { if (x == -y) { k = 3; } else { int t = x; x = x + y; y = t - y; if (x == y) k = 1; else if (x == -y) k = 2; else k = -1; } } cout << k << endl; return 0; }