CREATE TABLE table_name_73 (goals_against INTEGER, goals_for VARCHAR(255), points VARCHAR(255), wins VARCHAR(255))
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?
    
SQL: SELECT SUM(goals_against) FROM table_name_73 WHERE points < 13 AND wins < 3 AND goals_for < 15