N = list(input())
S = set()
for i in range(len(N) + 1):
    for n in range(10):
        nn = N[:]
        nn.insert(i, str(n))
        sn = str(int(''.join(nn)))
        if len(sn) == len(N) + 1:
            S.add(sn)
print(len(S))