class Main
  def start
    a = wash(input.split("")).reverse
    v = 1
    s = "*"
    while true
      x, flg = get_next_value a
      v = calc(v, x, s)
      break if not flg
      a, s = get_next_symbol a
    end
    echo ans = v
    return nil
  end

  private

  def calc(v, x, s)
    case s
    when "*"
      v * x
    when "+"
      v + x
    end
  end

  def get_next_symbol(a)
    s = a.pop
    return a, s
  end

  def get_next_value(a)
    s = ""
    while a.size > 0 && (0..9).map(&:to_s).include?(a.last)
      s += a.pop
    end
    flg = a.size > 0 ? true : false
    return s.to_i, flg
  end

  def wash(a)
    b = []
    for ai in a
      case ai
      when "*"
        b += ["+"]
      when "+"
        b += ["*"]
      else
        b += [ai]
      end
    end
    return b
  end

  def echo(*x)
    print(*x)
    puts
  end

  def input = gets.chomp
end

Main.new.start