/* -*- coding: utf-8 -*-
 *
 * 300.cc: No.300 平方数 - yukicoder
 */

#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<cmath>
#include<iostream>
#include<string>
#include<vector>
#include<map>
#include<set>
#include<stack>
#include<list>
#include<queue>
#include<deque>
#include<algorithm>
#include<numeric>
#include<utility>
#include<complex>
#include<functional>
 
using namespace std;

/* constant */

/* typedef */

typedef long long ll;

/* global variables */

/* subroutines */

/* main */

int main() {
  ll x;
  cin >> x;

  ll maxpp = 1;
  for (ll p = 1, pp = 1; (pp = p * p) <= x; p++)
    if (x % pp == 0) maxpp = pp;
  //printf("maxpp=%lld\n", maxpp);
  printf("%lld\n", x / maxpp);
  return 0;
}