Class 6 and Class 2 have a 1-minute rope skipping competition. The average score of group A is 65; the current scores of group B are as follows: 77, 53, 62, 58, and the last one has not jumped, so how many times does he have to jump at least to make this group win.
六2班进行1分钟跳绳比赛．A组平均成绩是65下；B组现在成绩如下：77，53，62，58，还剩最后一人没跳，那么他至少要跳多少下才能使本组取胜．
<result>76</result>