Table schema:
CREATE TABLE table_name_72 (silver INTEGER, nation VARCHAR, gold VARCHAR, total VARCHAR, bronze VARCHAR)

Question: What is the lowest number of silver medals received by Austria when they receive more than 3 total medals, more than 22 bronze medals, and fewer than 395 gold medals?
SQL: SELECT MIN(silver) FROM table_name_72 WHERE total > 3 AND bronze > 22 AND gold < 395 AND nation = "austria"