ds = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]

counter = 0
for m in range(12):
    for d in range(ds[m]):
        if m + 1 == (((d + 1) // 10) + ((d + 1) % 10)):
            counter = counter + 1

print(counter)