user: Question: What is the number of series with production code 503?
Columns: ['Series #', 'Season #', 'Title', 'Directed by', 'Written by', 'Original air date', 'Production code']
Types: ['real', 'real', 'text', 'text', 'text', 'text', 'real']
Sample row: [101.0, 1.0, '"Labor Paynes: Part 1"', 'Tyler Perry', 'Brandon Broussard', 'December3,2008', 501.0]
SQL:

assistant: SELECT COUNT("Series #") FROM "Table" WHERE "Production code" = 503.0;