user: Question: What is the total number of episodes listed with a production code of 306?
Columns: ['No.', '#', 'Title', 'Directed by', 'Written by', 'Canadian air date', 'U.S. air date', 'Production code', 'Canadian viewers (million)']
Types: ['real', 'real', 'text', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: [32.0, 1.0, '"Unconditional Love"', 'David Frazee', 'Mark Ellis & Stephanie Morgenstern', 'July16,2010', 'July 16, 2010', 301.0, '1.334']
SQL:

assistant: SELECT COUNT("#") FROM "Table" WHERE "Production code" = 306.0;