N = int(input())

cs = [c for c in str(N)]

used = set()
for i in range(len(cs)+1):
    for d in range(10):
        xs = cs.copy()
        xs.insert(i, str(d))

        x = int(''.join(xs))
        if len(str(x)) == len(cs)+1:
            used.add(x)

ans = len(used)
print(ans)