#include <bits/stdc++.h>

using namespace std;
typedef long long ll;

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

  ll ans = 1;
  for (ll i = 2; i * i <= x; i++) {
    if (x % i) continue;
    int cnt = 0;
    while (x % i == 0) {
      x /= i;
      cnt++;
    }
    if (cnt & 1) ans *= i;
  }
  if (x != 1) ans *= x;
  cout << ans << endl;

  return 0;
}