The fifth-grade students participate in the school's Sunshine Inter-class Competition. The number of students is between 70 and 80. If there are 6 people or 8 people in a row, they will all stand neatly and there will be no surplus. How many people in the fifth grade participated in this competition?
五年级学生参加学校的阳光大课间比赛，人数在70和80人之间，如果6人一列或8人一列，都正好站整齐，没有剩余．五年级有多少人参加了这次比赛？
<result>72</result>