How many product # have episode 1?
CREATE TABLE table_25528 (
    "Episode #" real,
    "Prod #" real,
    "Title" text,
    "Directed by" text,
    "Written by" text,
    "Originalairdate" text
)
SELECT MAX("Prod #") FROM table_25528 WHERE "Episode #" = '1'
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 product # have episode 1? ### Input: CREATE TABLE table_25528 (
    "Episode #" real,
    "Prod #" real,
    "Title" text,
    "Directed by" text,
    "Written by" text,
    "Originalairdate" text
) ### Response: SELECT MAX("Prod #") FROM table_25528 WHERE "Episode #" = '1'