01. Computer Store

total_price = 0

command = input()

while command != "special" and command != "regular":
    price = float(command)
    if price > 0:
        total_price += price
    else:
        print("Invalid price!")
    command = input()

if total_price == 0:
    print("Invalid order!")
else:
    print(
        f"Congratulations you've just bought a new computer!\n"
        f"Price without taxes: {total_price:.2f}$\n"
        f"Taxes: {total_price / 5:.2f}$\n"
        f"-----------\n"
        f"Total price: {total_price * 1.2 * (0.9 if command == 'special' else 1):.2f}$"
    )