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

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