def main():
    S = list(input())

    L = len(S)
    pattern = set()
    nums = ["1", "2", "3", "4", "5", "6", "7", "8", "9", "0"]

    for i in range(L + 1):
        for n in nums:
            if i == 0 and n == "0":
                continue

            T = S[:]
            T.insert(i, n)
            T = int("".join(T))
            pattern.add(T)

    print(len(pattern))
    return 0


main()