Ваканцията на Иванови: Ivanovi's Holiday;

using System;

namespace tESt
{
    class Program
    {
        static void Main(string[] args)
        {
            var nights = int.Parse(Console.ReadLine());
            var destenation = Console.ReadLine().ToLower();  // “Miami”, “Canary Islands”, “Philippines”.
            var transport = Console.ReadLine().ToLower();    // “train”, “bus” или “airplane”

            double sumChildren = 0;
            double sumAdults = 0;

            double sumdestanation = 0;
            double sumTickets = 0;

            double sumTotal = 0;

            if (nights <= 10)
            {
                if (destenation == "miami")
                {
                    sumAdults = (sumAdults + 24.99) * nights * 2;
                    sumChildren = (sumChildren + 14.99) * nights * 3;
                }
                if (destenation == "canary islands")
                {
                    sumAdults = (sumAdults + 32.50) * nights * 2;
                    sumChildren = (sumChildren + 28.50) * nights * 3;
                }
                if (destenation == "philippines")
                {
                    sumAdults =  42.99 * nights * 2;
                    sumChildren =  39.99 * nights * 3;
                }
            }
            else if (nights <= 15)
            {
                if (destenation == "miami")
                {
                    sumAdults =  + 22.99 * nights * 2;
                    sumChildren =  + 11.99 * nights * 3;
                }
                if (destenation == "canary islands")
                {
                    sumAdults = (sumAdults + 30.50) * nights * 2;
                    sumChildren = (sumChildren + 25.60) * nights * 3;
                }
                 if (destenation == "philippines")
                {
                    sumAdults = (sumAdults + 41) * nights * 2;
                    sumChildren = (sumChildren + 36) * nights * 3;
                }
            }
            else if (nights > 15)
            {
                if (destenation == "miami")
                {
                    sumAdults = (sumAdults + 20) * nights * 2;
                    sumChildren = (sumChildren + 10) * nights * 3;
                }
                 if (destenation == "canary islands")
                {
                    sumAdults = (sumAdults + 28) * nights * 2;
                    sumChildren = (sumChildren + 22) * nights * 3;
                }
                 if (destenation == "philippines")
                {
                    sumAdults = (sumAdults + 38.50) * nights * 2;
                    sumChildren = (sumChildren + 32.40) * nights * 3;
                }
            }

            sumdestanation = (sumAdults + sumChildren) * 1.25; //  25% dog expen

            if (transport == "train")
            {
                sumTickets = (2 * 22.30) + (3 * 12.50); //  2 adult, 3 children
            }
            if (transport == "bus")
            {
                sumTickets = (2 * 45) + (3 * 37);
            }
            if (transport == "airplane")
            {
                sumTickets = (2 * 90) + (3 * 68.50);
            }

            sumTotal = sumdestanation + sumTickets;

            Console.WriteLine($"{sumTotal:f3}");
        }
    }
}