#include<iostream>
#include<stdio.h>
#include<algorithm>
#include<vector>
#include<string.h>
#include<math.h>
#include<map>
#include<iomanip>
#include<queue>

using namespace std;

int main(){
	long long n;
	cin >> n;
	long long ans=0;
	for(long long a=2;a<=20000;a++){
		for(long long b=1;b<a;b++){
			long long x=(a+b);
			if(x==n/(a-b) && n%(a-b)==0){
				cout << 1 << endl;
				return 0;
			}
		}
	}
	cout << -1 << endl;
	return 0;
}
//123123