user: Question: How many goals against were scored when the points were smaller than 13, the wins were smaller than 3, and the goals for were smaller than 15?
Columns: ['Position', 'Club', 'Played', 'Points', 'Wins', 'Draws', 'Losses', 'Goals for', 'Goals against', 'Goal Difference']
Types: ['real', 'text', 'real', 'real', 'real', 'real', 'real', 'real', 'real', 'real']
Sample row: [1.0, 'Málaga', 10.0, 15.0, 6.0, 3.0, 1.0, 21.0, 15.0, 6.0]
SQL:

assistant: SELECT SUM("Goals against") FROM "Table" WHERE "Points" < 13.0 AND "Wins" < 3.0 AND "Goals for" < 15.0;