How do l view only the students with the top mark?

  class Program
    {
        static void Main(string[] args)
        {
            string surname;
            int score;
            int numRecords = 0;
            Console.WriteLine("How many students?");
            if (int.TryParse(Console.ReadLine(), out numRecords))
            {
                List<Student> lstStudent = new List<Student>();
                for (var i = 1; i <= numRecords; i++)
                {
                    Student student = new Student();
                    Console.WriteLine();
                    Console.Write("Enter Name:");
                    student.Name = Console.ReadLine();
                    Console.Write("Enter Surname:");
                    student.SurName = Console.ReadLine();
                    Console.Write("Enter Score:");
                    student.Score = int.Parse(Console.ReadLine());
                    lstStudent.Add(student);
                    Console.WriteLine();
                }
                lstStudent = (List<Student>)lstStudent.OrderByDescending(x => x.Score).ToList(); 
                

                for (int i = 0; i < lstStudent.Count; i++)
                {
                    Console.WriteLine("{1},{2},{3}", (i + 1).ToString(), lstStudent[i].Name, lstStudent[i].SurName, lstStudent[i].Score.ToString());
                }
            }
            Console.ReadLine();
        }
    }

    public class Student
    {
        public string Name { get; set; }
        public string SurName { get; set; }
        public Int32 Score { get; set; }
    }
}