#include <bits/stdc++.h>
int main() {
  long long n;
  while (~scanf("%I64d", &n)) {
    for (long long i = 2; i * i <= n; i++)
      while (n % (i * i) == 0) n /= i;
    printf("%I64d\n", n);
  }
  return 0;
}
