static void Main()
{
School testSchool = new School("NBU");
Class testClass = new Class("Network technologies");
Teacher testTeacher = new Teacher("Nikolay", "Kostov");
Discipline testDiscipline1 = new Discipline("C++ Fundamentials", 2, 2);
Discipline testDiscipline2 = new Discipline("C++ OOP", 2, 2);
Student testStudent = new Student("Stavri", "Stamenkov", 3);
testTeacher.AddDiscipline(testDiscipline1);
testTeacher.AddDiscipline(testDiscipline2);
testClass.AddStudent(new Student("Aleksandar", "Aleksandrov", 1));
testClass.AddStudent(new Student("Ivan", "Ivanov", 2));
testClass.AddStudent(testStudent);
testClass.AddStudent(new Student("Yavor", "Kolev", 4));
testClass.AddTeacher(testTeacher);
testSchool.AddClass(testClass);
testClass.RemoveStudent(testStudent);
Console.WriteLine(testSchool);
}