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
    a = Enum.sort(li())

    if Enum.all?(1..3, fn i -> Enum.at(a, 0) + i == Enum.at(a, i) end) do
      IO.puts "Yes"
    else
      IO.puts "No"
    end
  end
end