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

let arr n = Array.make (1000000 + (int_of_float (sqrt (float_of_int n)))) 0

let counter ls arr =
  for i = 0 to List.length ls - 1 do
    arr.(List.nth ls i) <- arr.(List.nth ls i) + 1
  done

let rec main arr ls i =
  if i > Array.length arr - 1 then List.fold_left (fun x y -> x * y) 1 ls
  else
    if arr.(i) mod 2 = 0 then main arr ls (i+1)
    else main arr (i :: ls) (i+1)

let () =
  let n = int_of_string (read_line ()) in
  let arr = arr n in
  let facts = factriz 2 [] n in
  counter facts arr;
  print_int (main arr [] 0)