budget = float(input())
money_left = budget
money_spent = 0
product_counter = 0
product_name = input()

while product_name != "Stop":
    product_price = float(input())
    product_counter += 1

    if product_counter % 3 == 0:
        product_price *= 0.5

    if product_price > money_left:
        money_needed = product_price - money_left
        print("You don't have enough money!")
        print(f'You need {money_needed:.2f} leva!')

    money_left -= product_price
    money_spent += product_price
    product_name = input()

if product_name == "Stop":
    print(f'You bought {product_counter} products for {money_spent:.2f} leva.')