The working hours of a certain company are from 8:30 am to 5:30 pm every day. Please calculate how many times the angle between the hour hand and the minute hand of the clock will form a right angle during this period.
某公司每天上班时间由上午8：30至下午5：30，请你算一算，这段时间内时钟的时针和分针的夹角会形成直角多少次．
<result>16</result>