user: Question: How many people can attend games in the stadium of the team whose captain is Vasil Vasilev?
Columns: ['Club', 'Location', 'Manager', 'Stadium', 'Capacity', 'Team captain']
Types: ['text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['Beroe', 'Stara Zagora', 'Ilian Iliev Category:Articles with hCards', 'Beroe', 17800.0, 'Slavi Zhekov']
SQL:

assistant: SELECT "Capacity" FROM "Table" WHERE "Team captain" = 'Vasil Vasilev';