###HUMAN: count the number of patients whose primary disease is pneumonia;human immunodefiency virus;rule out tuberculosis and year of death is less than or equal to 2168?, ###ASSISTANT: SELECT COUNT(DISTINCT demographic.subject_id) FROM demographic WHERE demographic.diagnosis = "PNEUMONIA;HUMAN IMMUNODEFIENCY VIRUS;RULE OUT TUBERCULOSIS" AND demographic.dod_year <= "2168.0"