import datetime
dt = datetime.date(2015, 1, 1)
count = 0
while dt.year == 2015:
    m =dt.month
    d_10 = dt.day // 10
    d_1 = dt.day % 10
    if m == d_10 + d_1:
        count += 1
    dt += datetime.timedelta(days=1) 
print(count)