#include <bits/stdc++.h>
using namespace std;
using ll = long long;

int main(){
  ll n;
  cin >> n;
  ll num = n;
  vector<pair<ll, int>>  P;
  for(ll i = 2; i*i <=n ;i++){
     int x = 0;
     while(num%i ==0){
           num  /=  i;
           x++;
    }
    if(x >=1) P.emplace_back(i, x);
  }
   if( num !=1) P.emplace_back(num, 1);
  ll ans = 1;
  for(auto x : P){
    if(x.second%2==1) ans *= x.first;
  }
  cout << ans << endl;
  return 0;
}