Christmas Preparation

packpaper_rolls = int(input())
textile_rolls = int(input())
glue_liters = float(input())
rabatt = int(input())
total_price = 0
price_with_rabatt = 0
paper_price = packpaper_rolls*5.80
textile_price = textile_rolls*7.20
glue_price = glue_liters*1.20
total_price = paper_price + textile_price + glue_price
price_with_rabatt = total_price - total_price*rabatt/100
print(f"{price_with_rabatt:.3f}")