s = [None, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
a = 0
for m in range(1, 13):
    for d in range(1, s[m]):
        dd = str(d)
        if len(dd) < 2:
            dd = '0' + dd
        if m == int(dd[0]) + int(dd[1]):
            a += 1
print(a)