what was the total of patient 273's input until 43 days ago?
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 = 273 ) ) and datetime(inputevents_cv.charttime) <= datetime(current_time,'-43 day')