count the number of times when they visited the hospital last time patient 26612 has had a aortocor bypas-1 cor art.
select count(*) from procedures_icd where procedures_icd.icd9_code = ( select d_icd_procedures.icd9_code from d_icd_procedures where d_icd_procedures.short_title = 'aortocor bypas-1 cor art' ) and procedures_icd.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 26612 and admissions.dischtime is not null order by admissions.admittime desc limit 1 )