One morning during the summer vacation, Mr. Chen Yongqing went to Jianyongshi Elementary School to visit 51 students in Class 4.1. Teacher Mi, the head teacher, called the whole class urgently. It took 1 minute to make a call. After receiving the call, the students immediately informed the other students with Teacher Mi. classmate. How many minutes will it take to inform the entire class.
暑假的一个早上，陈永庆先生到坚勇实小看望4.1班的51名学生，班主任米老师紧急用电话通知全班同学，打一个电话需要1分钟，学生接到电话后立即和米老师一起通知其他同学．通知完全班同学共需多少分钟．
<result>6</result>