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 adults = int.Parse(Console.ReadLine());
            int childrens = int.Parse(Console.ReadLine());
            int nights = int.Parse(Console.ReadLine());
            var transport = (Console.ReadLine()).ToLower();
            double amountNights = (nights * 82.99);
            double amountAdults = 0;
            double amountChildrens = 0;
            double groupQTY = adults + childrens;
            if (transport == "train")
            {
                if (groupQTY >= 50)
                {
                    amountAdults = adults * 24.99 * 0.5;
                    amountChildrens = childrens * 14.99 * 0.5;
                }
                else
                {
                    amountAdults = adults * 24.99;
                    amountChildrens = childrens * 14.99;

                }
            }
            else if (transport == "bus")
            {
                amountAdults = adults * 32.5;
                amountChildrens = childrens * 28.5;
            }
            else if (transport == "boat")
            {
                amountAdults = adults * 42.99;
                amountChildrens = childrens * 39.99;
            }
            else if (transport == "airplane")
            {
                amountAdults = adults * 70;
                amountChildrens = childrens * 50;
            }
            amountAdults *= 2;
            amountChildrens *= 2;

            Console.WriteLine("{0:F2}", (amountNights+amountAdults+amountChildrens)*1.1);

        }
    }
}