Table: iihf_womens_champs
Columns: games
first
last
gold
silver
bronze
total
best_finish_first_last

Question: What is the average medal total of the country who had 0 silver medals and participated in less than 15 games?
SQL: SELECT AVG("total") FROM iihf_womens_champs WHERE "games" < 15 AND "silver" < 0