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_5 (laps INTEGER, bike VARCHAR, grid VARCHAR, time VARCHAR)
### Question:
What is the sum of the laps with a grid less than 28, retirement time, and a ducati 1098 f08 bikes?
### Answer:
SELECT SUM(laps) FROM table_name_5 WHERE grid < 28 AND time = "retirement" AND bike = "ducati 1098 f08"