# your code goes here
import pandas as pd
d = pd.date_range('11-Sep-2017', '17-Sep-2017', freq='2D')
len(d[d.isin(pd.to_datetime(['12-09-2017', '15-09-2017']))])
print(len(d))
IyB5b3VyIGNvZGUgZ29lcyBoZXJlCmltcG9ydCBwYW5kYXMgYXMgcGQKCmQgPSBwZC5kYXRlX3JhbmdlKCcxMS1TZXAtMjAxNycsICcxNy1TZXAtMjAxNycsIGZyZXE9JzJEJykKbGVuKGRbZC5pc2luKHBkLnRvX2RhdGV0aW1lKFsnMTItMDktMjAxNycsICcxNS0wOS0yMDE3J10pKV0pCnByaW50KGxlbihkKSk=