#include<iostream>
#include<string>
#include<cstring>
#include<map>
using namespace std;
string s;
map<string, int> numbers;
int i,j,k;

int main(void) {
	
	cin>>s;
	int sol=0;
	
	for (i=1; i<s.length(); ++i) 
	 for (j=0; j<=9; ++j) {
	   
	   string s1="";
	   for (k=0; k<=i; ++k) s1+=s[k];
	   
	   s1+=char(j+48);
	   
	   for (k=i+1; k<s.length(); ++k) s1+=s[k];
	   
	   if (numbers[s1]==0) { ++sol; numbers[s1]=1; }
	 
     }
     
     cout<<sol;
	
	return 0;
}