one_page_price = float(input())
one_page_cover = float(input())
percent_discount_paper = int(input())
designer_sum = float(input())
total_sum = int(input())

starting_sum = one_page_price * 899 + one_page_cover * 2
discount = starting_sum - (starting_sum * percent_discount_paper / 100)
designer_price = discount + designer_sum
crew_money = designer_price - (designer_price * total_sum / 100)

print(f"Avtonom should pay {crew_money:.2f} BGN.")