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

typedef long long ll;

signed main(){
  ll X; cin >> X;
  int np = 0;
  for( int i = 2; 1LL * i * i <= X; ++i )
    np |= X % i == 0;
  if( not np )
    cout << X << endl, exit( 0 );
  ll Y = 1LL;
  for( int i = 2; 1LL * i * i <= X; ++i ){
    if( X % i == 0 ){
      int cnt = 0;
      while( X and X % i == 0 )
        ++cnt, X /= i;
      if( cnt & 1 )
        Y *= i; 
    }
  }
  cout << Y << endl;
  return 0;
}