s = gets.chomp

arr = s.each_char.chunk { |e| e.match?(/[*+]/) }.map { |bool, e| bool ? e[0] : e.join }

until arr.size == 1
  a, op, b = arr.shift(3)
  op.tr!('*+', '+*')
  arr.unshift(eval([a, op, b].join))
end

puts arr[0]