import java.util.Scanner

object Main {
  def main(args: Array[String]) = {
    val sc=new Scanner(System.in)
    var x=sc.nextLong
    var y:Long=1
    var i:Long=2
    while(i*i<=x) {
      while(x%i==0) {
        x=x/i
        if(y%i!=0) y=y*i else y=y/i
      }
      i=i+1
    }
    println(x*y)
  }
}