text: command = input()
  total_price = 0
  total_price_wiht_taxes = 0
  total_taxes = 0
  while command != "special" and command != "regular":
      if command == "special" or command == "regular":
          break
      price = float(command)
      if price < 0:
          print ("Invalid price!")
      else:
          tax = price * 0.2
          total_taxes += tax
          total_price += price
  
      command = input()
  
  total_price_wiht_taxes = total_price + total_taxes
  
  if command == "special":
      total_price_wiht_taxes = total_price_wiht_taxes - (total_price_wiht_taxes * 0.1)
  
  if total_price_wiht_taxes == 0:
      print("Invalid order!" )
  else:
      print("Congratulations you've just bought a new computer!")
      print (f'Price without taxes: {total_price:.2f}$')
      print(f'Taxes: {total_taxes:.2f}$')
      print('-----------')
      print(f"Total price: {total_price_wiht_taxes:.2f}$")
  