import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines

from datetime import datetime, timedelta

answer = 0
day = datetime(2015,1,1)
while day.year == 2015:
    m = day.month; d = day.day
    q,r = divmod(d,10)
    if m == q + r:
        answer += 1
    day += timedelta(days=1)
print(answer)