Travel Agency

using System;

namespace TravelAgency
{
    class Program
    {
        static void Main(string[] args)
        {
            string town = Console.ReadLine();
            string pack = Console.ReadLine();
            string vip = Console.ReadLine();
            int day = int.Parse(Console.ReadLine());
            double sum = 0;

            switch (town)
            {
                case "Bansko":
                case "Borovets":
                    switch (pack)
                    {
                        case "withEquipment":

                            switch (vip)
                            {
                                case "yes":
                                    sum = day * 90;
                                    if (day > 7)
                                    {
                                        sum = (day - 1) * 90;
                                    }
                                    break;
                                case "no":
                                    sum = day * 100;
                                    if (day > 7)
                                    {
                                        sum = (day - 1) * 100;
                                    }
                                    break;
                            }
                            break;

                        case "noEquipment":

                            switch (vip)
                            {
                                case "yes":
                                    sum = day * 76;
                                    if (day > 7)
                                    {
                                        sum = (day - 1) * 76;
                                    }
                                    break;
                                case "no":
                                    sum = day * 80;
                                    if (day > 7)
                                    {
                                        sum = (day - 1) * 80;
                                    }
                                    break;
                            }
                            break;
                    }
                    break;

                case "Varna":
                case "Burgas":
                    switch (pack)
                    {

                        case "withBreakfast":

                            switch (vip)
                            {
                                case "yes":
                                    sum = day * 114.4;
                                    if (day > 7)
                                    {
                                        sum = (day - 1) * 114.4;
                                    }
                                    break;
                                case "no":
                                    sum = day * 130;
                                    if (day > 7)
                                    {
                                        sum = (day - 1) * 130;
                                    }
                                    break;
                            }
                            break;

                        case "noBreakfast":

                            switch (vip)
                            {
                                case "yes":
                                    sum = day * 93;
                                    if (day > 7)
                                    {
                                        sum = (day - 1) * 93;
                                    }
                                    break;
                                case "no":
                                    sum = day * 100;
                                    if (day > 7)
                                    {
                                        sum = (day - 1) * 100;
                                    }
                                    break;
                            }
                            break;

                    }
                    break;

            }

            if (day < 1)
            {
                Console.WriteLine("Days must be positive number!");
            }
            else if (town != "Bansko" && town != "Borovets" && town != "Varna" && town != "Burgas"
                || pack != "noEquipment" && pack != "withEquipment" && pack != "noBreakfast" && pack != "withBreakfast"
                || vip != "yes" && vip != "no")
            {
                Console.WriteLine("Invalid input!");
            }
        }
    }
}