04. Tourist Shop from exam 05 2019

budget = float(input())
product_name = input()
product_price = 0
numb_of_item = 0
all_price = 0

while product_name != "Stop":
    product_price = float(input())
    numb_of_item += 1
    if numb_of_item % 3 == 0:
        product_price = product_price / 2
    else:
        pass
    all_price += product_price
    if (budget - all_price) < 0:
        print(f"You don't have enough money!")
        print(f"You need {abs(budget - all_price):.2f} leva!")
        exit()
    product_name = input()
print(f"You bought {numb_of_item} products for {all_price:.2f} leva.")