Vacation

using System;

namespace Vacation
{
    class Program
    {
        static void Main(string[] args)
        {
            int seniorsCount = int.Parse(Console.ReadLine());
            int studentsCount = int.Parse(Console.ReadLine());
            int sleepoversCount = int.Parse(Console.ReadLine());
            string transport = Console.ReadLine();

            double ticketCostForSenior = 32.5;
            double ticketCostForStudent = 28.5;
            if (transport == "train")
            {
                ticketCostForSenior = 24.99;
                ticketCostForStudent = 14.99;

                if (seniorsCount + studentsCount >= 50)
                {
                    ticketCostForSenior *= 0.5;
                    ticketCostForStudent *= 0.5;
                }
            }
            else if (transport == "boat")
            {
                ticketCostForSenior = 42.99;
                ticketCostForStudent = 39.99;
            }
            else if (transport == "airplane")
            {
                ticketCostForSenior = 70.0;
                ticketCostForStudent = 50.0;
            }

            double totalCostForTicket = ((ticketCostForSenior * seniorsCount) +
                                         (ticketCostForStudent * studentsCount)) *
                                         2;
            double costForSleepovers = sleepoversCount * 82.99;

            double totalCost = (totalCostForTicket + costForSleepovers) * 1.1;

            Console.WriteLine($"{totalCost:f2}");
        }
    }
}