user: Question: How many directors were there for series # 431?
Columns: ['Series #', 'Season #', 'Title', 'Director', 'Writer(s)', 'Airdate']
Types: ['real', 'real', 'text', 'text', 'text', 'text']
Sample row: [410.0, 1.0, '" Snap Decision "', 'Mark Rydell Category:Articles with hCards', 'Dick Carr Category:Articles with hCards', 'September 17, 1966']
SQL:

assistant: SELECT COUNT("Director") FROM "Table" WHERE "Series #" = 431.0;