defmodule Main do 
  def main do
    n = IO.gets("") |> String.trim |> String.to_integer
    _ = IO.gets("")
    IO.stream(:stdio, :line) |> Enum.take(n) |> Enum.map(&String.trim/1) |> Enum.map(&String.to_integer/1) |> Enum.sort |> (fn list -> Enum.at(list, -1) - Enum.at(list, 0) end).() |> IO.puts
  end
end