make a count of the number of times patient 58730 has received a vasc shunt & bypass nec when they came to the hospital first time.
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 = 'vasc shunt & bypass nec' ) and procedures_icd.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 58730 and admissions.dischtime is not null order by admissions.admittime asc limit 1 )