import sys
input = lambda :sys.stdin.readline()[:-1]
ni = lambda :int(input())
na = lambda :list(map(int,input().split()))
yes = lambda :print("yes");Yes = lambda :print("Yes");YES = lambda : print("YES")
no = lambda :print("no");No = lambda :print("No");NO = lambda : print("NO")
#######################################################################
n = list(input())
ans = set()
for i in range(len(n)+1):
    a = list(n)
    for j in range(10):
        a.insert(i,str(j))
        if a[0] != "0":
            ans.add(int("".join(a)))
        a.pop(i)

#print(ans)
print(len(ans))