Teacher Wang wants to inform the students about something. Assuming that the notification is made by phone, it takes 1 minute for each person to be notified by phone. In the first minute, Teacher Wang notifies student A. In the second minute, Teacher Wang notifies student B1, and student A notifies student B2. ． By analogy, there are 127 students in the class, how many minutes will it take to complete the notification?
王老师要向同学们通知一件事，假定用电话通知，每打电话通知1人用1分钟，第一分钟王老师通知了A同学，第二分钟王老师通知B1同学，A同学通知B2同学．依此类推，全班共有127名同学，需要多少分钟通知完？
<result>7</result>