provide the daily maximum amount of po intake that patient 23436 has received on the first icu visit.
select max(inputevents_cv.amount) from inputevents_cv where inputevents_cv.icustay_id in ( select icustays.icustay_id from icustays where icustays.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 23436 ) and icustays.outtime is not null order by icustays.intime asc limit 1 ) and inputevents_cv.itemid in ( select d_items.itemid from d_items where d_items.label = 'po intake' and d_items.linksto = 'inputevents_cv' ) group by strftime('%y-%m-%d',inputevents_cv.charttime)