Alchohol market

whisky_price=float(input())
beer=float(input())
wine=float(input())
rakia=float(input())
whisky=float(input())
rakia_price=whisky_price/2
total=whisky*whisky_price+rakia*rakia_price+wine*(rakia_price*0.6)+beer*(rakia_price*0.2)
print(f"{total:.2f}")