instruction: provide me with the total amount of chest tube output: mediastinal anterior patient 015-33796 produces on the last icu visit.
response: SELECT SUM(intakeoutput.cellvaluenumeric) FROM intakeoutput WHERE intakeoutput.patientunitstayid IN (SELECT patient.patientunitstayid FROM patient WHERE patient.patienthealthsystemstayid IN (SELECT patient.patienthealthsystemstayid FROM patient WHERE patient.uniquepid = '015-33796') AND NOT patient.unitdischargetime IS NULL ORDER BY patient.unitadmittime DESC LIMIT 1) AND intakeoutput.celllabel = 'chest tube output: mediastinal anterior' AND intakeoutput.cellpath LIKE '%output%'