fun readStr () =
    let
        fun scan reader stream = SOME (StringCvt.splitl (not o Char.isSpace) reader (StringCvt.skipWS reader stream))
    in
        valOf (TextIO.scanStream scan TextIO.stdIn)
    end


val () =
    let
        val n = readStr ()
        val ans = if String.size n = 3 then n
                  else if String.size n = 2 then "0" ^ n
                  else "00" ^ n
    in
        print (ans ^ "\n")
    end