The student activities office has four students who work part-time on a work-study program. Three of the students work 15 hours per week, 19 hours per week, and 14 hours per week. The office policy is that the average number of hours students work per week in the student activities office is less than 16.5 hours. What is the restriction for the number of hours that the fourth student can work? The fourth student can work less than hours.