At generic middle school 8 students were sick with the flu on the first day of school. By the end of the first week 12 students were sick and by the end of the 2nd week there were 18 students sick. The attendance clerk noticed that the number of students getting sick was growing exponentially with a growth factor of '1.5'. A function model that desribes the number that have gotten sick would S(x) = 8 (1.5*), where x is the number of weeks completed at school. Using the model, how many students could be expected to have been sick by the end of the 6th week?