There are 40 people in a dance team. There is an emergency performance during the summer vacation. The teacher should notify each team member as soon as possible. If they call to notify, one team member will be notified every minute.
一个舞蹈队共有40人，暑假期间有一个紧急演出，老师要尽快通知到每个队员，如果打电话通知，每分钟通知一位队员，全部通知完要多少分钟．
<result>6</result>