Among the posts that were voted by user 1465, what is the id of the most valuable post?
user 1465 refers to UserId = 1465; the most valuable post refers to MAX(FavoriteCount);
SELECT T2.Id FROM votes AS T1 INNER JOIN posts AS T2 ON T1.PostId = T2.Id WHERE T1.UserId = 1465 ORDER BY T2.FavoriteCount DESC LIMIT 1