fun readLargeInt () =
    valOf (TextIO.scanStream (LargeInt.scan StringCvt.DEC) TextIO.stdIn)
              

val () =
    let
        val n = readLargeInt ()
        val k = readLargeInt ()
        val t = readLargeInt ()

        val ans = if abs n <= k * t then "Yes"
                  else "No"
    in
        print (ans ^ "\n")
    end