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_2296507_1 (stellar_classification VARCHAR, system VARCHAR)
### Question:
Name number of stellar classification for 3 neptune planets < 1 au
### Answer:
SELECT COUNT(stellar_classification) FROM table_2296507_1 WHERE system = "3 Neptune planets < 1 AU"