defmodule Main do
  
  def main do
    IO.read(:line) |> String.trim() |> String.split(" ") |> Enum.map(&String.to_integer/1) |> solve() |> IO.puts()
  end

  def solve([a, b]) when a == b, do: a + b - 1
  def solve([a, b]) when a < b, do: a * 2
  def solve([a, b]) when b < a, do: b * 2

end