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
    x = ii()

    s = Stream.cycle([2, 2, -1, -1, 2, -1, -1])
    f(s, 0, 0, x)
    |> IO.puts
  end

  def f(s, p, d, x) do
    t = Enum.take(s, 1) |> hd
    p2 = p + t
    d2 = d + abs(t)
    if p2 == x do
      d2
    else
      f(Stream.drop(s, 1), p2, d2, x)
    end
  end
end