N = list(input())

S = set()
for i in range(len(N)):
    for j in range(1 if i == 0 else 0, 10):
        n = N[:]
        n.insert(i, str(j))
        S.add("".join(n))
for i in range(10):
    n = N[:]
    n.append(str(i))
    S.add("".join(n))

print(len(S))