user: Question: How many 1st leg have team 1 OFK Belgrade?
Columns: ['Tie no', 'Team 1', 'Agg.', 'Team 2', '1st leg', '2nd leg']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'Borac Banja Luka', '2–1', 'Osijek', '2–0', '0–1']
SQL:

assistant: SELECT COUNT("1st leg") FROM "Table" WHERE "Team 1" = 'OFK Belgrade';