using System;

public class Program

{

    public static void Main()

    {   

        Console.WriteLine("Брой младши:");

        var juniors = int.Parse(Console.ReadLine());

        Console.WriteLine("Брой старши:");

        var seniors = int.Parse(Console.ReadLine());

        string trail = "trail";

        string cross = "cross-country";

        string down = "downhill";

        string road = " road";

        Console.WriteLine("Вид на трасето:");

        string track = Console.ReadLine().ToLower();

        var sum = juniors + seniors;

        if ((track != trail) && (track != cross) && (track != down) && (track != road))

            {

            Console.WriteLine("error");

            }

        else

            {

                if (track == trail) //При trail

                    {

                    var price = juniors * 5.50 + seniors * 7;

                    if ( sum >= 50 )

                        {

                        var money = ( price - price * 0.25 );

                        Console.WriteLine( money - money * 0.05 );

                        }

                    else

                        {

                         Console.WriteLine( price - price*0.05);

                        }

                    }

                if (track == cross) //При cross-country

                    {

                    var price = juniors * 8 + seniors * 9.50;

                    if ( sum >= 50 )

                        {

                        var money = ( price - price * 0.25 );

                        Console.WriteLine( money - money * 0.05 );

                        }

                    else

                        {

                        Console.WriteLine( price - price*0.05);

                        }

                    }

                if (track == down) //При downhill

                    {

                    var price = juniors * 12.25 + seniors * 13.75;

                    if ( sum >= 50 )

                        {

                        var money = ( price - price * 0.25 );

                        Console.WriteLine( money - money * 0.05 );

                        }

                    else

                        {

                        Console.WriteLine( price - price*0.05);

                        }

                    }

                if (track == road) //При road

                    {

                    var price = juniors * 20 + seniors * 21.50;

                    if ( sum >= 50 )

                        {

                        var money = ( price - price * 0.25 );

                        Console.WriteLine( money - money * 0.05 );

                        }

                    else

                        {

                        Console.WriteLine( price - price*0.05);

                        }

                    }

            }

        //Наталия Петрова 11Б

    }

}