Alcohol Market

priceWhiskey = float(input())
beerQuantity = float(input())
wineQuantity = float(input())
brandyQuantity = float(input())
whiskeyQuantity = float(input())

priceBrandy = (priceWhiskey / 2)
priceWine = priceBrandy - (0.4 * priceBrandy)
priceBeer = priceBrandy - (0.8 * priceBrandy)

sumWhiskey = (priceWhiskey * whiskeyQuantity)
sumBrandy = (priceBrandy * brandyQuantity)
sumWine = (priceWine * wineQuantity)
sumBeer = (priceBeer * beerQuantity)
print('%.2f' % (sumWhiskey+sumBrandy+sumWine+sumBeer))