what is the number of times that patient 1249 had had a pe 20 fs po intake in 03/2102?
select count(*) from inputevents_cv where inputevents_cv.icustay_id in ( select icustays.icustay_id from icustays where icustays.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 1249 ) ) and inputevents_cv.itemid in ( select d_items.itemid from d_items where d_items.label = 'pe 20 fs po' and d_items.linksto = 'inputevents_cv' ) and strftime('%y-%m',inputevents_cv.charttime) = '2102-03'