public static void Main() { ////Write three classes: Student, Course and School. Students should have name and unique number ////(inside the entire School). Name can not be empty and the unique number is between 10000 ////and 99999. Each course contains a set of students. Students in a course should be less than ////30 and can join and leave courses. var course = new Course("Mathematics"); course.Add(new Student("Gogo", "Petrov", 13154)); course.Add(new Student("Ivan", "Ivanov", 13274)); course.Add(new Student("Dimitar", "Asparuhov", 11334)); Console.WriteLine(); }