supplies_for_school

pen_count = int(input())
marker_count = int(input())
detergent_lt = int(input())
discount_percent = int(input())

price_packege_pen = pen_count * 5.8
price_packege_marker = marker_count * 7.2
price_detergent = detergent_lt * 1.2
price_all_materials = price_packege_pen + price_packege_marker + price_detergent
discount = price_all_materials * discount_percent / 100
total_price = price_all_materials - discount
print(total_price)