#include<bits/stdc++.h>
#define REP(i,n) for(int i=0;i<(n);i++)
#define ALL(v) (v).begin(),(v).end()
#define int long long

using namespace std;
typedef pair<int,int> P;

//-----------------------------------------------------------------------

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

    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;

}