calculate the total of patient 594's input amounts since 01/11/2104.
select sum(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 = 594 ) ) and strftime('%y-%m-%d',inputevents_cv.charttime) >= '2104-01-11'