defmodule Main do
  def main do
    IO.gets("")
    |> String.trim()
    |> solve
    |> IO.puts()
  end

  defp solve(s) do
    s
    |> String.to_charlist()
    |> Enum.map(fn x ->
      [x]
      |> to_string
      |> (&(case Integer.parse(&1) do
              {n, _} -> n
              _ -> 0
            end)).()
    end)
    |> Enum.sum()
  end
end