budget = float(input())
price_tot = 0
product_counter = 0

while price_tot <= budget:
    price_name = input()
    if price_name == "Stop":
        print(f"You bought {product_counter} products for {price_tot:.2f} leva.")
        break
    price_product = float(input())
    product_counter += 1
    if product_counter % 3 == 0:
        price_product -= price_product * 0.50
    price_tot += price_product
else:
    print(f"You don't have enough money!\nYou need {(price_tot - budget):.2f} leva!")