from datetime import datetime, timedelta
a = datetime.strptime('20150101', '%Y%m%d')
b = datetime.strptime('20151231', '%Y%m%d')
count = 0
while a <= b:
    d = [int(i) for i in str(datetime.strftime(a, '%m%d'))]
    if sum(d[:2]) == sum(d[2:]):
        count += 1
    a += timedelta(days=1)
print(count)