Sea Trip

money_food = float(input())
money_souvenirs = float(input())
money_hotel = float(input())
money_gas = ((420 / 100)*7)*1.85

money_first_day = money_hotel * 0.9
money_second_day = money_hotel * 0.85
money_third_day = money_hotel * 0.80

needed_money = money_first_day + money_second_day + money_third_day + money_souvenirs * 3 + money_gas + money_food * 3

print(f"Money needed: {needed_money:.2f}")