budget = float(input())
counter = 0
given_money = 0
price = 0
while True:
    product_name = input()
    if product_name == "Stop":
        print(f"You bought {counter} products for {given_money:.2f} leva.")
        break
    price = float(input())
    if price > budget:
        print(f"You don't have enough money!")
        print(f"You need {price - budget:.2f} leva!")
        break
    counter += 1
    if counter // 3 == 1:
        price = price * 0.50
    given_money += price
    budget -= price