#include <bits/stdc++.h>
#define rep(i,n) for(int i=0;i<n;i++)
typedef long long ll;
const int MOD = ((int)1e9)+7;
const int INF = (int)(1e9)+(int)(1e7);
const ll INFL = (ll)(1e18)+INF;
const double EPS = 1e-8;
using namespace std;
int main()
{
    int X,Y;
    cin >> X >> Y;
    int ans;
    if(X==Y)ans=0;
    else if(Y==0)ans=1;
    else if(X==0)ans=2;
    else if(X==-Y)ans=3;
    else ans=-1;

    cout << ans << endl;
    return 0;
}