#include<iostream>
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<algorithm>
#include<vector>
#include<math.h>
#include<iomanip>
#include<stack>
#include<queue>
#include<set>
#include<map>
 
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
 
//const ll mod = 1000000007;
const ll mod = 998244353;
const ld pi = 3.14159265358979;

ll gcd(ll a , ll b){
	if(a < b)swap(a , b);
	if(b == 0)return 1;
	if(a % b == 0)return b;
	else return gcd(b , a % b);
}

bool isPrime(ll x){
	if(x == 2 || x == 3 || x == 5 || x == 7){
		return true;
	}
	for(int i = 3; i * i <= x; i++){
		if(x % i == 0)return false;
	}
	return true;
}


vector<int> divisor(ll x){
	vector<int> ret;
	for(int i = 2; i * i <= x; i++){
		while(x % i == 0){
			ret.push_back(i);
			x /= i;
		}
	}
	if(x > 1)ret.push_back(x);
	return ret;
}


int main(){	
	cin.tie(0);
	ios::sync_with_stdio(false);
	//cout << fixed << setprecision(15);
	int x , y;
	cin >> x >> y;
	if(x == y){
		cout << 0 << endl;
		exit(0);
	}
	if(x > 0 && y == 0){
		cout << 1 << endl;
		exit(0);
	}
	if(x == 0 && y > 0){
		cout << 2 << endl;
		exit(0);
	}
	if(x + y == 0 && x > 0 && y < 0){
		cout << 3 << endl;
		exit(0);
	}
	if(x + y == 0 && x < 0 && y > 0){
		cout << 4 << endl;
		exit(0);
	}
	cout << -1 << endl;
	return 0;
}