class Yukicoder
  def initialize
    s = gets.chomp

    list = s.chars
    queue = []
    eval_flag = false
    answer = 0

    while !list.empty?
      ch = list.shift

      if ch == '+'
        queue << '*'
        eval_flag = true
      elsif ch == '*'
        queue << '+'
        eval_flag = true
      elsif eval_flag
        queue << ch

        answer += eval(queue.join)

        queue = []
        eval_flag = false
      else 
        queue << ch
      end
    end

    puts answer
  end
end

Yukicoder.new