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_20 (swing_to_gain VARCHAR, constituency VARCHAR)
### Question:
how many times is the constituency edinburgh northern and leith?
### Answer:
SELECT COUNT(swing_to_gain) FROM table_name_20 WHERE constituency = "edinburgh northern and leith"