18, whatcha think?

SELECT * FROM gallery2 WHERE topic_id="195384" UNION SELECT * FROM gallery2 WHERE topic_id="1627076" UNION SELECT * FROM gallery2 WHERE topic_id="496205" UNION SELECT * FROM gallery2 WHERE topic_id="1442893" UNION SELECT * FROM gallery2 WHERE topic_id="1467246" UNION SELECT * FROM gallery2 WHERE topic_id="1561562" UNION SELECT * FROM gallery2 WHERE topic_id="1807910" UNION SELECT * FROM gallery2 WHERE topic_id="701026" UNION SELECT * FROM gallery2 WHERE topic_id="607762" UNION SELECT * FROM gallery2 WHERE topic_id="1220305" UNION SELECT * FROM gallery2 WHERE topic_id="1520629" UNION SELECT * FROM gallery2 WHERE topic_id="85891" UNION SELECT * FROM gallery2 WHERE topic_id="1567215" UNION SELECT * FROM gallery2 WHERE topic_id="710643" UNION SELECT * FROM gallery2 WHERE topic_id="222827" UNION SELECT * FROM gallery2 WHERE topic_id="795773"