Easter Bakery

flour_kg = float(input())
flour_price = float(input())
sugar_kg = float(input())
egg_pack = float(input())
yeast = float(input())

flour_total = flour_kg * flour_price
sugar_total = flour_kg * sugar_kg * 0.75
egg_pack_total = flour_kg * egg_pack * 1.1
yeast_total = flour_kg * 0.75 * yeast * 0.2
total_sum = flour_total + sugar_total + egg_pack_total + yeast_total

print(f"{total_sum:.2f}")