instruction: calculate the amount of 7.7meq naacetate patient 7524 has taken on the last icu visit.
response: 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 = 7524) AND NOT icustays.outtime IS NULL ORDER BY icustays.intime DESC LIMIT 1) AND inputevents_cv.itemid IN (SELECT d_items.itemid FROM d_items WHERE d_items.label = '7.7meq naacetate' AND d_items.linksto = 'inputevents_cv')