supplies for school

pens = int(input())
markers = int(input())
liters = int(input())
percent = int(input())

price_pens = pens * 5.80
price_markers = markers * 7.20
price_prep = liters * 1.20
total_price = price_prep + price_markers + price_pens
final_price = total_price - total_price * (percent / 100)
print(final_price)