help
sum
insert
1
70
sum
insert
2
100
insert
3
70
insert
4
70
rank
1
insert
5
70
insert
6
70
ave
insert
7
70
insert
8
70
insert
9
60
insert
10
70
insert
12
90
sum
insert
15
80
sum
ave
insert
13
90
sum
exit