open System

let factorize n =
  let split p n =
      let mutable n = n
      let mutable k = 0L
      while n % p = 0L do
          k <- k + 1L
          n <- n / p
      (n, k)

  [ let m = ref n
    let p = ref 2L
    while (! p) * (! p) <= n do
      let (m', k) = split (! p) (! m)
      if k > 0L then yield (! p, k)
      p := (! p) + 1L
      m := m'
      ]

let solve n =
  factorize n
  |> List.choose (fun (k, v) -> if v % 2L <> 0L then Some k else None)
  |> List.fold (*) 1L

[<EntryPoint>]
let main _ =
  let x = Console.ReadLine() |> int64
  printfn "%d" (solve x)

  //exit code
  0