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.sub (n, 0) = #"-" then "0"
            else if String.size n <= 2 then "0"
            else String.substring (n, 0, String.size n - 2)
    in
        print (ans ^ "\n")
    end