what is patient 52736's minimum albumin value?
select min(labevents.valuenum) from labevents where labevents.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 52736 ) and labevents.itemid in ( select d_labitems.itemid from d_labitems where d_labitems.label = 'albumin' )