food_expenses = float(input())
souvenir_expenses = float(input())
hotel_expenses = float(input())


km = 420
l_fuel = km / 100 * 7

fuel_expenses = l_fuel * 1.85
all_money_food_souvenir= 3 * food_expenses + 3 * souvenir_expenses
all_hotel_exp = hotel_expenses * 0.9 + hotel_expenses * 0.85 + hotel_expenses * 0.8

total_money = fuel_expenses + all_money_food_souvenir + all_hotel_exp

print(f'Money needed: {total_money:.2f}')