import scala.annotation.tailrec
import scala.io.StdIn

object Problem300 {

  // 素因数分解
  def primeFactorization(n: Long): Seq[Long] = {
    @tailrec
    def factor(n: Long, div: Long, result: Seq[Long]): Seq[Long] = {
      if (n < div * div) {
        n +: result
      } else if (n % div == 0) {
        factor(n / div, div, div +: result)
      } else {
        factor(n, div + 1, result)
      }
    }
    factor(n, 2, Nil)
  }

  def proc(x: Long): Long = {
    val pf: Map[Long, Seq[Long]] = primeFactorization(x).groupBy(x => x)
    val oddPf: Map[Long, Seq[Long]] = pf.filter(_._2.length % 2 == 1)
    oddPf.keys.product
  }

  def main(args: Array[String]) {
    val x = StdIn.readLong()
    val result: Long = proc(x)
    println(result)
  }
}