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_40 (laps INTEGER, time_retired VARCHAR, grid VARCHAR)
### Question:
In grid 15, how many laps were there before ending with a time of exhaust?
### Answer:
SELECT SUM(laps) FROM table_name_40 WHERE time_retired = "exhaust" AND grid < 15