#include <bits/stdc++.h>
using namespace std;
using i64 = long long;
#define rep(i,s,e) for(int (i) = (s);(i) <= (e);(i)++)

int x,y;
int main(){
  cin >> x >> y;
  if(y == x){
    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;
}