#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for(int i = 0; i < (n);i++)
#define sz(x) int(x.size())
typedef long long ll;
typedef long double ld;
typedef pair<int,int> P;
constexpr int mod = 1e9+7;
int main(){ 
  string s;
  cin >> s;
  int ok = 0;
  if (s.size() == 1 && s[0] == '1') {
    cout << -1 << endl;
    return 0;
  }
  rep(i,s.size()) {
    ok *= 10;
    ok += int(s[i] - '0');
    ok %= 4;
  }
  if (ok != 2) cout << 1 << endl;
  else cout << -1 << endl;
  return 0; 
}