#include <bits/stdc++.h>
#define int ll
using namespace std;
#define rep(i,n) for(int i=0;i<n;i++)
#define per(i,n) for(int i=n-1;i>=0;i--)
#define rng(i,c,n) for(int i=c;i<n;i++)
#define fi first
#define se second
#define pb push_back
#define sz(a) (int)a.size()
#define vec(...) vector<__VA_ARGS__>
#define _48SMghu ios::sync_with_stdio(0),cin.tie(0)
using ll=long long;
using pii=pair<int,int>;
using vi=vector<int>;
void print(){cout<<'\n';}
template<class h,class...t>
void print(const h&v,const t&...u){cout<<v<<' ',print(u...);}

void slv(){
	string s;
	cin>>s;
	set<int> st;
	rep(i,sz(s)+1){
		rep(x,10){
			if(!i and !x) continue;
			string ns=s;
			ns.insert(ns.begin()+i,(char)(x+'0'));
			st.insert(stoll(ns));
		}
	}
	print(sz(st));
}

signed main(){
_48SMghu;
	slv();
}