Cruise Ship

using System;

namespace CruiseShip
{
    class Program
    {
        static void Main(string[] args)
        {
            string destination = Console.ReadLine();
            string cabinType = Console.ReadLine();
            int overnights = int.Parse(Console.ReadLine());

            double dayPrice = 0;

            if (destination == "Mediterranean")
            {
                if (cabinType == "standard cabin")
                {
                    dayPrice = 27.50;
                }
                else if (cabinType == "cabin with balcony")
                {
                    dayPrice = 30.20;
                }
                else
                {
                    dayPrice = 40.50;
                }
            }
            else if (destination == "Adriatic")
            {
                if (cabinType == "standard cabin")
                {
                    dayPrice = 22.99;
                }
                else if (cabinType == "cabin with balcony")
                {
                    dayPrice = 25.00;
                }
                else
                {
                    dayPrice = 34.99;
                }
            }
            else
            {
                if (cabinType == "standard cabin")
                {
                    dayPrice = 23.00;
                }
                else if (cabinType == "cabin with balcony")
                {
                    dayPrice = 26.60;
                }
                else
                {
                    dayPrice = 39.80;
                }
            }

            double totalSum = dayPrice * 4 * overnights;
            if (overnights > 7)
            {
                totalSum *= 0.75;
            }
            Console.WriteLine($"Annie's holiday in the {destination} sea costs {totalSum:f2} lv.");
        }
    }
}

РЕШЕНИЕ С ТЕРНАРЕН ОПЕРАТОР:

using System;

namespace CruiseShip
{
    class Program
    {
        static void Main(string[] args)
        {
            string destination = Console.ReadLine();
            string cabinType = Console.ReadLine();
            int overnights = int.Parse(Console.ReadLine());

            double dayPrice =
                destination == "Mediterranean" ?
                (cabinType == "standard cabin" ? 27.50 : cabinType == "cabin with balcony" ? 30.20 : 40.50) :
               destination == "Adriatic" ?
               (cabinType == "standard cabin" ? 22.99 : cabinType == "cabin with balcony" ? 25.00 : 34.99) :
               (cabinType == "standard cabin" ? 23.00 : cabinType == "cabin with balcony" ? 26.60 : 39.80);

            double totalSum = dayPrice * 4 * overnights * (overnights > 7 ? 0.75 : 1);

            Console.WriteLine($"Annie's holiday in the {destination} sea costs {totalSum:f2} lv.");
        }
    }
}