Vacation

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Vacation
{
    class Vacation
    {
        static void Main(string[] args)
        {
            int elderly = int.Parse(Console.ReadLine());
            int school = int.Parse(Console.ReadLine());
            int nights = int.Parse(Console.ReadLine());
            string transport = Console.ReadLine().ToLower();
            double sumPriceForPeople = 0;
            double priceForElderly = 0.0;
            double priceForScholl = 0.0;
            double result = 0;
            double priceForHotel = nights * 82.99;
            if (transport == "train")
            {
                if (elderly + school < 50)
                {
                    priceForElderly = elderly * 24.99;
                    priceForScholl = school * 14.99;
                    sumPriceForPeople = (priceForElderly + priceForScholl) * 2;
                    double comision = (sumPriceForPeople + priceForHotel) * 0.10;
                    result = sumPriceForPeople + priceForHotel + comision;
                }
                else
                {
                    priceForElderly = elderly * 24.99;
                    priceForScholl = school * 14.99;
                    sumPriceForPeople = (priceForElderly + priceForScholl);
                    double comision = (sumPriceForPeople + priceForHotel) * 0.10;
                    result = sumPriceForPeople + priceForHotel + comision;
                }
            }
            else if (transport == "bus")
            {
                priceForElderly = elderly * 32.50;
                priceForScholl = school * 28.50;
                sumPriceForPeople = (priceForElderly + priceForScholl) * 2;
                double comision = (sumPriceForPeople + priceForHotel) * 0.10;
                result = sumPriceForPeople + priceForHotel + comision;
            }
            else if (transport == "boat")
            {
                priceForElderly = elderly * 42.99;
                priceForScholl = school * 39.99;
                sumPriceForPeople = (priceForElderly + priceForScholl) * 2;
                double comision = (sumPriceForPeople + priceForHotel) * 0.10;
                result = sumPriceForPeople + priceForHotel + comision;
            }
            else if (transport == "airplane")
            {
                priceForElderly = elderly * 70;
                priceForScholl = school * 50;
                sumPriceForPeople = (priceForElderly + priceForScholl) * 2;
                double comision = (sumPriceForPeople + priceForHotel) * 0.10;
                result = sumPriceForPeople + priceForHotel + comision;
            }
            Console.WriteLine($"{result:f2}");
        }
    }
}