#include<bits/stdc++.h>
#define nl "\n"
#define fi first
#define se second
#define pi 3.14159
#define ll long long
#define odd(a)  (a&1)
#define even(a)  !(a&1)
#define Mod 1'000'000'007
#define INF 2'000'000'000 // 2e9
#define sz(x) int(x.size())
#define charToInt(s) (s - '0')
#define ull unsigned long long
#define number_line iota(all(vec) , 1)
#define all(s) s.begin(), s.end()
#define rall(v) v.rbegin() , v.rend()
#define fixed(n) fixed << setprecision(n)
#define Num_of_Digits(n) ((int)log10(n) + 1)
#define to_decimal(bin) stoll(bin, nullptr, 2)
#define Ceil(n, m) (((n) / (m)) + ((n) % (m) ? 1 : 0))
#define Floor(n, m) (((n) / (m)) - ((n) % (m) ? 0 : 1))
#define Upper(s) transform(all(s), s.begin(), ::toupper);
#define Lower(s) transform(all(s), s.begin(), ::tolower);
#define cout_map(mp) for(auto& [f, s] : mp) cout << f << "  " << s << "\n";
//  ----- bits-------
#define pcnt(n) __builtin_popcount(n)
#define pcntll(n) __builtin_popcountll(n)
#define clz(n) __builtin_clz(n)    // <---100
#define clzll(n) __builtin_clzll(n)
#define ctz(n) __builtin_ctz(n)  // 0001---->
#define ctzll(n) __builtin_ctzll(n)

using namespace std;

template < typename T = int > istream& operator >> (istream &in, vector < T > & v){
    for(auto & x : v) in >> x;
    return in;
}

template < typename T = int > ostream& operator << (ostream &out, const vector < T > & v){
    for(const T & x : v) out << x << " ";
    return out;
}

void esraa()
{
    //freopen("shuffle.in", "r", stdin), freopen("shuffle.out", "w", stdout);
    ios_base::sync_with_stdio(false), cin.tie(nullptr), cout.tie(nullptr);
#ifndef ONLINE_JUDGE
    freopen("input.txt", "r", stdin), freopen("output.txt", "w", stdout);
#endif
}
void solve(){
    ll n , ans = 0;
    cin >> n;
    if(n <= 9) return cout << n + 1 << nl, void();
    if(n == 10) cout << 10 << nl;
    else{
        string s = to_string(n) , t;
        // 271828182
        // 22
        // 11
        //

        for(int i = 0 ; i < sz(s) ; i++){
            t += s[0];

        }
        ll temp = stoll(t) , cnt = 0 , Sz = 0 , num;
        //271828182
        // 9 -> 2
        // 9 -> 1
        // sz - 1 * 8
        if(temp >= n) Sz = sz(t) , num = t[0] - '0';
        else Sz = sz(t) - 1 , num = t[0] - '0' - 1;
        for(int i = num ; i >= 1 ; i--) cnt += Sz;
        cnt += (Sz - 1) * (10 - num + 2);
        cout << cnt << nl;
    }



}
int main()
{
    esraa();
    int t = 1;
    //cin >> t;
    //cin.ignore();
    while(t--)
      solve();
    return 0;
}