let rec factriz i ls n =
  if i * i > n then n :: ls
  else
    if i = 2 then
      if n mod 2 = 0 then factriz i (i :: ls) (n / i)
      else factriz (i+1) ls n
    else
      if n mod i = 0 then
	factriz i (i :: ls) (n / i)
      else
	factriz (i+2) ls n

let rec matchls n = function
    [] ->true
   |hd :: tl -> if n <> hd then matchls n tl
	     else false

let rec main ls ls1 =
  match ls with
    [] -> List.fold_left (fun x y -> x * y) 1 ls1
   |hd :: tl -> if matchls hd ls1 = false then main tl (List.filter ((fun x y -> x <> y) hd) ls1)
		else main tl (hd :: ls1)

let () =
  let n = int_of_string (read_line ()) in
  print_int (main (factriz 2 [] n) [])