static void Main()
        {
            var student = new List<Student>
            {
            new Student("Ivan", "Ivanov",18,1,"021234","",new List<int> {5, 3, 5, 6},1),
            new Student("Pesho", "Peshev",18,2,"+3592321638","[email protected]",new List<int> {5, 2, 5, 6},1),
            new Student("Petko", "Petkov",19,3,"07113","[email protected]",new List<int> {5, 2, 5, 6},2),
            new Student("Goshko", "Goskov",19,4,"083545","[email protected]",new List<int> {5, 2, 2, 5},2),
            new Student("Mariika", "Marieva",20,5,"+359 2 554135435","[email protected]",new List<int> {6, 2, 6, 4},1),
            new Student("Rositza", "Roseva",21,6,"112345","[email protected]",new List<int> {4, 2, 2, 3},2),
            new Student("Ivan", "Petkov",36,7,"524354","[email protected]",new List<int> {6, 2, 6, 6},3),
            };
            var countThem = student.ExtentionCount();

            foreach (var st in countThem)
            {
                Console.WriteLine("{0} {1} {2}",st.FirstName, st.LastName, string.Join(" ",st.Marks));
            }
        }
    static void Main()
    {
        var students = new List<Student>
		{
			new Student("Dimitar", "Dimitrov",20,1,"0897777777","[email protected]",new List<int> {5, 3, 4, 6},2),
			new Student("Georgi", "Ivanov",22,2,"0897553344","[email protected]",new List<int> {5, 4, 5, 6},1),
			new Student("Ivan", "Georgiev",20,3,"0888664425","[email protected]@g,ail.com",new List<int> {6, 6, 5, 6},1),
			new Student("Dimitrinka", "Ivanova",22,4,"02-12356","[email protected]",new List<int> {5, 5, 5, 5},2),
			new Student("Katya", "Georgieva",18,5,"03022221","[email protected]",new List<int> {4, 5, 6, 4},1),
			new Student("Mishael", "Tonchev",18,6,"0878919299","[email protected]",new List<int> {4, 2, 2, 6},2),
		};
        var countThem = students.ExtentionCount();

        foreach (var st in countThem)
        {
            Console.WriteLine("{0} {1} {2}", st.FirstName, st.LastName, string.Join(" ", st.Marks));
        }


    }