06. Charity Campaign *

numberDays = int(input())
numberWorkers = int(input())
numberCakes = int(input())
numberGoffrets = int(input())
numberPancaces = int(input())
numberCakesDaily = numberCakes * 45
numberGoffretsDaily = numberGoffrets * 5.80
numberPancacesDaily = numberPancaces * 3.20
allAmountFor1Day = (numberCakesDaily + numberPancacesDaily + numberGoffretsDaily) * numberWorkers
amountAllCamp = allAmountFor1Day * numberDays
afterPaying = amountAllCamp - (amountAllCamp/8)
print(afterPaying)