N = input()
pre = ""

S = set()
for _ in range(len(N)+1):
    if pre == "":
        for i in range(1, 10):
            S.add(str(i)+N)
    else:
        for i in range(10):
            S.add(pre + str(i) + N)
    if N:
        pre = pre + N[0]
        N = N[1:]

print(len(S))