#include "bits/stdc++.h"
using namespace std;
#define Would
#define you
const int INF = 999999999;
const int MOD = 1e9 + 7;
const double pi = 3.141592653589793238;

int main() {
	int a, b, ans;
	cin >> a >> b;
	if (a == b) { ans = 0; }
	else if (b == 0) { ans = 1; }
	else if (a == 0) { ans = 2; }
	else if (a == -b) { ans = 3; }
	else { ans = -1; }
	cout << ans << endl;
}