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


val () =
    let
        val n = readInt ()
        val s = readInt ()

        val ans = if 25 <= s - (n - 1) andalso s < n * 30
                  then "Yes"
                  else "No"
    in
        print (ans ^ "\n")
    end