How many million U.S. viewers watched the episode with the production code 3x6004?
CREATE TABLE table_26464364_1 (
    us_viewers__million_ VARCHAR,
    production_code VARCHAR
)
SELECT us_viewers__million_ FROM table_26464364_1 WHERE production_code = "3X6004"
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 million U.S. viewers watched the episode with the production code 3x6004? ### Input: CREATE TABLE table_26464364_1 (
    us_viewers__million_ VARCHAR,
    production_code VARCHAR
) ### Response: SELECT us_viewers__million_ FROM table_26464364_1 WHERE production_code = "3X6004"