charity

campaign_days = int(input())
pastry_cook = int(input())
cakes = int(input())
waffles = int(input())
pancakes = int(input())
cake_price = 45
waffles_price = 5.80
pancakes_price = 3.20
total_sum = pastry_cook * campaign_days * ((cakes * cake_price) + (waffles * waffles_price) +
                                           (pancakes * pancakes_price))
expenses = total_sum - total_sum / 8
print(expenses)