#include <bits/stdc++.h>
using namespace std;
int main() {
  long long n;
  cin >> n;
  for (long long i = 2; i * i <= n; i++) {
    if (n % (i * i) == 0) {
      while (n % (i * i) == 0) n /= (i);
    }
  }
  cout << n;
  return 0;
}
