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
    s = input()

    c = String.at(s, -1)
    t = String.slice(s, 0..-2//1)
    ans = t <> if c == "0", do: "1", else: "0"
    IO.puts ans
  end
end