#include <bits/stdc++.h>
#define rep(i,n) for(int i = 0; i < (n); ++i)
#define srep(i,s,t) for (int i = s; i < t; ++i)
#define drep(i,n) for(int i = (n)-1; i >= 0; --i)
using namespace std;
typedef long long int ll;
typedef pair<int,int> P;
#define yn {puts("Yes");}else{puts("No");}
#define MAX_N 200005

int main() {
    int x, y;
    cin >> x >> y;

    if(x == y){
        cout << 0 << endl;
    }else if(x == 0){
        cout << 2 << endl;
    }else if(y == 0){
        cout << 1 << endl;
    }else if(x == -y){
        cout << 3 << endl;
    }else{
        cout << -1 << endl;
    }

    return 0;
}