#include <bits/stdc++.h>
using namespace std;
typedef long long int ll;
typedef pair<ll, ll> P;
typedef vector<ll> VI;
typedef vector<VI> VVI;
const ll MOD = 1000000007;
const ll INF = 1e18;
#define REP(i, n) for(int i = 0; i < n; i++)
#define ALL(v) v.begin(), v.end()

int main(){
	string s; cin >> s;
	int n=s.size(), a;
	if(n>=2)
		a=(s[n-2]-'0')*10+(s[n-1]-'0');
	else
		a=(s[n-1]-'0');
	if((a%4==0||a%2==1)&&s!="1"&&s!="4")
		cout << 1 << endl;
	else
		cout << -1 << endl;
	return 0;
}