# -*- utf-8 -*-
days = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
cnt=0
for month in range(1, 13):
    for day in range(1, days[month - 1] + 1):
        if (int(month) == int(day / 10) + day % 10):
            cnt += 1
print(cnt)