static void Main()
 {
     // creating teachers
        // we need e set of discip
     Disciplines disc1 = new Disciplines("Math", 23, 140);
     Disciplines disc2 = new Disciplines("Biology", 23, 140);
     Disciplines disc3 = new Disciplines("OOP", 23, 140);
     IList<Disciplines> disciplines = new List<Disciplines>();
     disciplines.Add(disc1);
     disciplines.Add(disc2);
     disciplines.Add(disc3);
     //disciplines can have comments
     disc1.Comment("I am free this week");
     // and that is the teacher with his disciplines
     Teachers teacher1 = new Teachers("Petrow",disciplines);
     //he can make comments
     teacher1.Comment("Ivancho is bad");
     //you can see his comment
     Console.WriteLine(teacher1.SayComment());
     //we can make second teacher and than a set of teachers
     Teachers teacher2 = new Teachers("Stoqnow", disciplines);
     IList<Teachers> setOfTeachers = new List<Teachers>();
     setOfTeachers.Add(teacher1);
     setOfTeachers.Add(teacher2);
     // to create a class we need and a set of students
     // first we create a few students
     Students student1 = new Students("Ivancho", 7);
     Students student2 = new Students("Mariika", 16);
     Students student3 = new Students("Qworcho",25);
     IList<Students> setOfStudents = new List<Students>();
     setOfStudents.Add(student1);
     setOfStudents.Add(student2);
     setOfStudents.Add(student3);
     // now we can ctreate class
     Classes class1 = new Classes("10b", setOfStudents, setOfTeachers);
     // the classes can make comments
     class1.Comment("We are happy class");
     // finaly we make a list of classes
     Classes class2 = new Classes("11v",setOfStudents,setOfTeachers);
     IList<Classes> setOfClasses = new List<Classes>();
     setOfClasses.Add(class1);
     setOfClasses.Add(class2);
     //school
     School school1 = new School(setOfClasses);
     Console.WriteLine(school1.ToString());
 }