defmodule Main do
  def main do
    IO.read(:line)
    |> String.trim()
    |> String.to_integer()
    |> solve
    |> IO.puts()
  end

  def solve(i) do
    1..i
    |> Enum.join()
    |> String.to_charlist
    |> Enum.at(i - 1)
    |> (&([&1])).()
  end
end