Find the first name of students who are living in the dorm that has most number of amenities.
select t1.fname from student as t1 join lives_in as t2 on t1.stuid = t2.stuid where t2.dormid in (select t2.dormid from dorm as t3 join has_amenity as t4 on t3.dormid = t4.dormid join dorm_amenity as t5 on t4.amenid = t5.amenid group by t3.dormid order by count(*) desc limit 1)