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])
    pred = fn {p, _d} -> p == x end
    next = fn {p, d}, x -> {p+x, d+abs(x)} end
    {_, d} = loop(s, {0, 0}, pred, next)
    IO.puts d
  end

  def loop(stream, acc, pred, next) do
    x = Enum.take(stream, 1) |> hd
    a = next.(acc, x)
    if pred.(a) do
      a
    else
      loop(Stream.drop(stream, 1), a, pred, next)
    end
  end
end