CREATE TABLE table_name_73 (goals_against INTEGER, goals_for VARCHAR, points VARCHAR, wins VARCHAR)
SELECT SUM(goals_against) FROM table_name_73 WHERE points < 13 AND wins < 3 AND goals_for < 15
มีกี่ประตูที่ทำได้เมื่อคะแนนน้อยกว่า 13 ชนะน้อยกว่า 3 และประตูน้อยกว่า 15
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?