How many different people directed the episode titled 'Born under a bad sign'?
CREATE TABLE table_1840 (
    "No. in series" real,
    "No. in season" real,
    "Title" text,
    "Directed by" text,
    "Written by" text,
    "Original air date" text,
    "Production code" text,
    "U.S. viewers (million)" text
)
SELECT COUNT("Directed by") FROM table_1840 WHERE "Title" = 'Born Under a Bad Sign'
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 different people directed the episode titled 'Born under a bad sign'? ### Input: CREATE TABLE table_1840 (
    "No. in series" real,
    "No. in season" real,
    "Title" text,
    "Directed by" text,
    "Written by" text,
    "Original air date" text,
    "Production code" text,
    "U.S. viewers (million)" text
) ### Response: SELECT COUNT("Directed by") FROM table_1840 WHERE "Title" = 'Born Under a Bad Sign'