Thomas needs to book a place to sit a test next week, but is free only in the mornings. The test centre runs the test every day from Monday to Friday and holds a morning and an afternoon sitting. Each sitting has a total of 100 places available and will take place in the main hall unless there are 30 or fewer candidates, in which case a smaller room is used. He does not like to take tests in crowded places, so he wants to make sure that he is in the main hall and will try to be with the smallest number of other candidates possible. The number of places that are still available are shown in the table below.