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

while True:
    product = input()
    if product == "Stop":
        print(f'You bought {product_counter} products for {money_spent:.2f} leva.')
        break
    product_price = float(input())
    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!')

    if (product_counter + 1) % 3 == 0:
        product_price *= 0.5

    product_counter += 1
    money_left -= product_price
    money_spent += product_price