How many people wrote the episode with 3.40 million U.S viewers?
CREATE TABLE table_26748252_1 (
    written_by VARCHAR,
    us_viewers__in_millions_ VARCHAR
)
SELECT COUNT(written_by) FROM table_26748252_1 WHERE us_viewers__in_millions_ = "3.40"
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: How many people wrote the episode with 3.40 million U.S viewers? ### Input: CREATE TABLE table_26748252_1 (
    written_by VARCHAR,
    us_viewers__in_millions_ VARCHAR
) ### Response: SELECT COUNT(written_by) FROM table_26748252_1 WHERE us_viewers__in_millions_ = "3.40"