nylon_price = 1.5
paint_price = 14.5
thinner_price = 5

nylon = int(input())
paint = int(input())
thinner = int(input())
hours = int(input())

total_nylon = (nylon + 2) * nylon_price
paint_no_extra = paint * paint_price
total_paint = paint_no_extra + paint_no_extra * 0.1
total_thinner = thinner * thinner_price

material_cost = total_nylon + total_paint + 0.4 + total_thinner
job_price = material_cost * 0.3 * hours
total = material_cost + job_price

print(total)