defmodule Main do
  def input, do: IO.read(:line) |> String.trim
  def ii, do: input() |> String.to_integer
  def li, do: input() |> String.split |> Enum.map(&String.to_integer/1)
  def yn(b), do: IO.puts (if b, do: "Yes", else: "No")

  def main do
    [_n, s, b] = li()
    h = li()

    init = Enum.at(h, 0) + s*b
    Enum.reduce_while(h, init, fn x, acc ->
      if acc < x do
        {:halt, -1}
      else
        {:cont, max(acc, x + s*b)}
      end
    end)
    |> then(fn x -> x > 0 end)
    |> yn()
  end
end