instruction: how many patients whose death status is 0 and primary disease is atrial septal defect\mitral valve replacement;repair atrial-septal defect/sda?
response: SELECT COUNT(DISTINCT demographic.subject_id) FROM demographic WHERE demographic.expire_flag = "0" AND demographic.diagnosis = "ATRIAL SEPTAL DEFECT\MITRAL VALVE REPLACEMENT;REPAIR ATRIAL-SEPTAL DEFECT/SDA"