user: Question: How many episodes were written by Seth Hoffman, Russel Friend & Garrett Lerner?
Columns: ['No.', '#', 'Title', 'Directed by', 'Written by', 'U.S. viewers (million)', 'Rank (week)', 'Original air date']
Types: ['real', 'real', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [133.0, 1.0, '" Now What? "', 'Greg Yaitanes', 'Doris Egan', '10.54', 'N/A', 'September20,2010']
SQL:

assistant: SELECT COUNT("Rank (week)") FROM "Table" WHERE "Written by" = 'Seth Hoffman, Russel Friend & Garrett Lerner';