defmodule Main do
  def main do
    n = IO.gets("") |> String.trim |> String.to_integer

    m = :math.sqrt(8 * n + 1)
    k = trunc(m)
    ans = cond do
      k == m ->
        "YES\n#{div(k, 2)}"
      true ->
        "NO"
    end

    IO.puts ans
  end
end