# coding=utf-8

ans = 0

def be_int(x):
    y = list(str(x))
    z = 0
    for k in y:
        z += int(k)
    return z

for i in range(1, 12):
    for j in range(1, 31):
        if i == be_int(j):
            ans += 1
print(ans)