user: Question: What is the combined of Crowd when richmond played at home?
Columns: ['Home team', 'Home team score', 'Away team', 'Away team score', 'Venue', 'Crowd', 'Date']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['Collingwood', '18.17 (125)', 'South Melbourne', '12.12 (84)', 'Victoria Park', 26000.0, '22 June 1946']
SQL:

assistant: SELECT SUM("Crowd") FROM "Table" WHERE "Home team" = 'richmond';