public static int calcSoftFour(Session aSession, Lecture aLecture) {
		int penalty = 0;
		List<Student> studentsEnrolledInLec = aLecture.getEnrolledStudents();
		for(Student student : studentsEnrolledInLec){
			List<Lecture> studentsLectures = student.getEnrolledLectures();
			List<Session> studentSessions = new ArrayList<Session>();
			for(Lecture lecture: studentsLectures){
				Session session = lecture.getSession();
				if(session != null){
					studentSessions.add(lecture.getSession());
				}
			}
			int totalTimeOnDay = 0;
			for(Session session: studentSessions){
				if(session.getDay().equals(aSession.getDay())){
					totalTimeOnDay += (session.getLength() + aSession.getLength());
				}
			}
			if(totalTimeOnDay > 5){
				penalty+=50;
			}
		}
		return penalty;
	}