n = list(input())
S = set()
for i in range(0, len(n) + 1):
    n2 =n[::]
    for j in range(0, 10):
        n2 = n[::]
        n2.insert(i, str(j))
        if n2[0] != 0:
            n2 = int(''.join(n2))
            S.add(n2)
print(len(S)-1)