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_28 (year VARCHAR, competition VARCHAR, event VARCHAR)
### Question:
How many years was the 400 m event in the olympic games?
### Answer:
SELECT COUNT(year) FROM table_name_28 WHERE competition = "olympic games" AND event = "400 m"