/*
 * Reference: http://lizan.asia/blog/2012/12/11/scala-competitive/
 */

object Main extends App {
  import java.{util => ju}
  import scala.annotation._
  import scala.collection._
  import scala.collection.{mutable => mu}
  import scala.collection.JavaConverters._
  import scala.math._

  val sc = new ju.Scanner(System.in)
  @tailrec
  private final def t(v : Long , p : Long, acc : Long) : Long = {
    if (v < p * p) {
      return acc * v
    }
    var cnt = 0
    var x = v
    while (x % p == 0) {
       cnt = 1 - cnt
        x /= p
    }
    var nacc = acc
    if (cnt == 1) nacc *= p
    t(x, p + 1, nacc)
  }
  val q = sc.nextLong
  println(t(q, 2, 1))
}