processor = float(input())
processor *= 1.57
video_card = float(input())
video_card *= 1.57
ram = float(input())
ram *= 1.57
number_of_ram_slots = ram * int(input())
discount_percent = float(input())
discount = processor + video_card - (processor + video_card * (discount_percent / 100))
total_price = processor + video_card + ram
print(total_price)