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

  def solve(s) do
    {n, rest} = s |> Integer.parse()
    solve_rec(n, rest)
  end

  def solve_rec(acc, "") do
    acc
  end

  def solve_rec(acc, rest) do
    {h, t} = rest |> String.split_at(1)
    {n, rest2} = t |> Integer.parse()

    case h do
      "*" ->
        solve_rec(acc + n, rest2)

      "+" ->
        solve_rec(acc * n, rest2)
    end
  end
end