18
INSERT 10
INSERT 5
INSERT 20
INSERT 15
INSERT 30
SUM 0 100
SUM 5 20
SUM 6 19
SUM 15 15
SUM 21 29
COUNT 20
RANGE 10 30
DELETE 20
SUM 5 30
SUM 16 100
SUM 21 29
RANGE 30 10
SUM 30 10