#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 <= sqrt(x)+10; i++){
    ll cnt = 0;
    while(x%i == 0){
      x /= i;
      cnt++;
    }
    if(cnt%2 == 1){
      ans *= i;
    }
  }
  cout << ans*x << endl;
  return 0;
}