07. Theatre Promotion(with ternary operator)

using System;

namespace TheatrePromotions
{
    class Program
    {
        static void Main(string[] args)
        {
            string day = Console.ReadLine();
            int age = int.Parse(Console.ReadLine());
            int sum = 0;

            if (age >= 0 && age < 123)
            {
                if (day == "Weekday")
                {
                    sum = age > 18 && age <= 64 ? 18 : 12;
                }
                else if (day == "Weekend")
                {
                    sum = age > 18 && age <= 64 ? 20 : 15;
                }
                else if (day == "Holiday")
                {
                    sum = age <= 18 ? 5 : age > 64 ? 10 : 12;
                }
            }
            Console.WriteLine(sum == 0 ? "Error!" : $"{ sum}$");
        }
    }
}