def number_sum(x):
    b = x // 10
    c = x % 10
    return b + c

a = 0
for m in [1,3,5,7,8,10,12]:
    for d in range(1, 32):
        if m == number_sum(d):
            a += 1
            
for m in [4,6,9,11]:
    for d in range(1, 31):
        if m == number_sum(d):
            a += 1
            
for d in range(1,29):
    if 2 == number_sum(d):
        a += 1

print(a)