There are 35 members in the school dance team. The teacher should notify each member of the team for emergency training. If the method of "one pass one call" is used, how many minutes will it take at least. (One call takes 1 minute)
学校舞蹈队共有35人，老师要通知每一位队员进行急训，如果采用"一传一"的打电话的方法，至少需要多少分钟．(打一次电话用1分钟)
<result>6</result>