import collections,sys,math,functools,operator,itertools,bisect,heapq,decimal,string,time,random
#sys.setrecursionlimit(10**9)
#sys.set_int_max_str_digits(0)
#input = sys.stdin.readline
n = int(input())
#alist = list(map(int,input().split()))
#alist = []
#s = input()
#n,m = map(int,input().split())
#for i in range(n):
#    alist.append(list(map(int,input().split())))
x = list(str(n))
s = set()
for i in range(len(x)+1):
    
    for j in range(10):
        temp = x[:]
        temp.insert(i,str(j))
        s.add(int(''.join(temp)))
        #print(temp)
print(len(s)-1)