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_13 (laps INTEGER, driver VARCHAR, grid VARCHAR)
### Question:
How many laps for denny hulme with under 4 on the grid?
### Answer:
SELECT SUM(laps) FROM table_name_13 WHERE driver = "denny hulme" AND grid < 4