How many people wrote the episode directed by Arvin Brown?
CREATE TABLE table_31434 (
    "Series #" real,
    "Title" text,
    "Directed by" text,
    "Written by" text,
    "Original air date" text,
    "Viewers (million)" text
)
SELECT COUNT("Written by") FROM table_31434 WHERE "Directed by" = 'Arvin Brown'
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 directed by Arvin Brown? ### Input: CREATE TABLE table_31434 (
    "Series #" real,
    "Title" text,
    "Directed by" text,
    "Written by" text,
    "Original air date" text,
    "Viewers (million)" text
) ### Response: SELECT COUNT("Written by") FROM table_31434 WHERE "Directed by" = 'Arvin Brown'