There are 30 people in a dance performance team. There is an emergency performance during the "May 1st" period. The teacher wants to notify each team member as soon as possible. If you make a call and notify one person per minute, how many minutes will it take to notify everyone.
一个舞蹈表演队共有30人，"五一"期间有一个紧急演出，老师想尽快通知到每个队员．如果打电话，每分钟通知1人，至少需要多少分钟可以通知到每个人．
<result>5</result>