01. Sea Trip

using System;

namespace Exam
{
    class Program
    {
        static void Main(string[] args)
        {
            double foodMoney = double.Parse(Console.ReadLine());
            double souvenirMoney = double.Parse(Console.ReadLine());
            double hotelMoney = double.Parse(Console.ReadLine());

            double sumForTransport = (420.0 / 100.0) * 7 * 1.85;
            double foodAndSouvenir = 3 * foodMoney + 3 * souvenirMoney;
            double sumForStay = hotelMoney * 0.9 + hotelMoney * 0.85 + hotelMoney * 0.8;

            double totalSum = sumForTransport + foodAndSouvenir + sumForStay;
            Console.WriteLine($"Money needed: {totalSum:f2}");
        }
    }
}