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

#define FOR(i,a,b) for(ll i=(a);i<(b);++i)
#define ALL(v) (v).begin(), (v).end()
#define p(s) cout<<(s)<<endl
#define p2(s, t) cout << (s) << " " << (t) << endl
#define br() p("")
#define pn(s) cout << (#s) << " " << (s) << endl
#define p_yes() p("Yes")
#define p_no() p("No")

const ll mod = 1e9 + 7;
const ll inf = 1e18;

template < typename T >
void vprint(T &V){
	for(auto v : V){
    	cout << v << " ";
	}
	cout << endl;
}

int main(){
    cin.tie(0);
    ios::sync_with_stdio(false);

    // input
    ll X, Y;
    cin >> X >> Y;

    if(X==Y){
        p(0);
        return 0;
    }    

    if(Y==0){
        p(1);
        return 0;
    }

    if(X==0){
        p(2);
        return 0;
    }

    if(X == -Y){
        p(3);
        return 0;
    }
    else{
        p(-1);
    }

    return 0;
}