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


val () =
    let
        val i = readInt ()
        val j = readInt ()
        val k = readInt ()
                                 
        val ans = if i <= j andalso i <= k then "Yes"
                  else "No"
    in
        print (ans ^ "\n")
    end