import strutils, tables

proc factorize(x:int): CountTable[int] =
  var x = x
  result = initCountTable[int]()
  var d = 2
  while d*d <= x:
    while x mod d == 0:
      result.inc(d, 1)
      x = x div d
    d += 1
  if x > 1: result.inc(x, 1)

var
  x = stdin.readLine.parseInt
  res = 1

for k, v in factorize(x):
  if bool(v and 1):
    res *= k
echo res