user: Question: How many episodes were released on DVD in the US on October 13, 2009?
Columns: ['DVD name', 'Episodes', 'Region 1 (CAN)', 'Region 1 (US)', 'Region 2 (FR)', 'Region 4']
Types: ['text', 'real', 'text', 'text', 'text', 'text']
Sample row: ['Season 1', 13.0, 'October 13, 2009', 'October 13, 2009', 'August 25, 2010', 'April 16, 2009']
SQL:

assistant: SELECT SUM("Episodes") FROM "Table" WHERE "Region 1 (US)" = 'October 13, 2009';