ans = 0
for i in range(1, 12):
    a = [4, 6, 9, 11]
    if i in a:
        jj = 30
    elif i == 2:
        jj = 29
    else:
        jj = 31
    
    for j in range(1, jj):
        if j < 10:
            c = j
        else:
            tmp1 = j // 10
            tmp2 = j % 10
            c = tmp1 + tmp2
        if i == c:
            ans = ans + 1
    
print(ans)