n = input().strip()
s = list(n)
k = len(s)
result = set()

for i in range(k + 1):
    for d in range(10):
        if i == 0 and d == 0:
            continue  # 先頭に0を挿入できない
        if i == 0 and d != 0:
            new_num = ''.join(s[:i]) + str(d) + ''.join(s[i:])
            result.add(new_num)
        elif i != 0:
            new_num = ''.join(s[:i]) + str(d) + ''.join(s[i:])
            result.add(new_num)

print(len(result))