import sys
input = lambda :sys.stdin.readline().rstrip()
ii = lambda: int(input())
mi = lambda: map(int, input().split())
ms = lambda: map(str, input().split())
mf = lambda: map(float, input().split())
li = lambda: list(mi())

N = input()
se = set()
for i in range(10):
    for j in range(len(N) + 1):
        if(i==0 and j==0): continue
        se.add(N[:j] + str(i) + N[j:])

print(len(se))