Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_22 (grid INTEGER, laps VARCHAR, rider VARCHAR)
### Question:
Which Grid has Laps of 24, and a Rider of marco melandri?
### Answer:
SELECT SUM(grid) FROM table_name_22 WHERE laps = 24 AND rider = "marco melandri"