#include<bits/stdc++.h>

using namespace std;

#define int long long

int32_t main(){
    
    int x, y;
    cin >> x >> y;
    if(x == y){
        cout << 0 << endl;
    }
    else if(y == 0){
        cout << 1 << endl;
    }
    else if(x == 0){
        cout << 2 << endl;
    }
    else if(x == -y){
        cout << 3 << endl;
    }
    else{
        cout << -1 << endl;
    }
    return 0;

}