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_21481509_4 (COUnT VARCHAR, population VARCHAR)
### Question:
How many n are listed for berbers from siwa?
### Answer:
SELECT COUnT AS n FROM table_21481509_4 WHERE population = "Berbers from Siwa"