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


fun findXAns s =
    let
        val s' = valOf (LargeInt.fromString (String.substring (s, 1, String.size s - 1)))
        val t = 4294967296 - s'
    in
        LargeInt.toString t
    end


val () =
    let
        val s = readStr ()

        val ans = if String.sub (s, 0) = #"x" then findXAns s
                  else s
    in
        print (ans ^ "\n")
    end