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

int main() {
	int A, B;
	cin >> A >> B;

	int a = 0;
	if (!B) {
		a = 1;
	}
	else {
		if ((A > 0) && (B > 0)) {
			a = -1;
		}
		else {
			if (A == -1) {
				a = 2;
			}
			else {
				a = -1;
			}
		}
	}

	cout << a << endl;
}