fun readInt () =
    valOf (TextIO.scanStream (Int.scan StringCvt.DEC) TextIO.stdIn)


val () =
    let
        val n = readInt ()
       
        val ans = if (n div 100) + (n mod 10) = (n mod 100) div 10 then "Yes"
                  else "No"
    in
        print (ans ^ "\n")
    end