days = [31,28,31,30,31,30,31,31,30,31,30,31]
count = 0
for i in range(1,13):
    for j in range(1, days[i-1]+1):
        if j < 10:
            if j == i:
                count += 1
        else:
            ten, one = [int(x) for x in str(j)]
            if ten + one == i:
                count += 1
print(count)