#include <bits/stdc++.h>
// #include <x86intrin.h>
using namespace std;
#if __cplusplus >= 202002L
using namespace numbers;
#endif



int main(){
	cin.tie(0)->sync_with_stdio(0);
	cin.exceptions(ios::badbit | ios::failbit);
	string s;
	cin >> s;
	set<long long> res;
	for(auto c = '1'; c <= '9'; ++ c){
		res.insert(stoll(c + s));
	}
	for(auto i = 1; i <= (int)s.size(); ++ i){
		for(auto c = '0'; c <= '9'; ++ c){
			res.insert(stoll(s.substr(0, i) + c + s.substr(i)));
		}
	}
	cout << (int)res.size() << "\n";
	return 0;
}

/*

*/