#include <bits/stdc++.h>
using namespace std;
using ll=long long;
using vb=vector<bool>;
using vvb=vector<vb>;
using vd=vector<double>;
using vvd=vector<vd>;
using vi=vector<int>;
using vvi=vector<vi>;
using vl=vector<ll>;
using vvl=vector<vl>;
using pll=pair<ll,ll>;
using tll=tuple<ll,ll>;
using tlll=tuple<ll,ll,ll>;
using vs=vector<string>;
#define all(a) a.begin(),a.end()
#define rall(a) a.rbegin(),a.rend()
#define rep(i,n) range(i,0,n)
#define rrep(i,n) for(ll i=(n)-1;i>=0;i--)
#define range(i,a,n) for(ll i=(a);i<(n);i++)
#define LINF ((ll)1ll<<62)
#define INF ((int)1<<30)
#define EPS (1e-9)
#define MOD (1000000007ll)
#define fcout(a) cout<<setprecision(a)<<fixed
#define fs first
#define sc second
#define PI (3.1415926535897932384)

int dx[]={1,0,-1,0,1,-1,-1,1},dy[]={0,1,0,-1,1,1,-1,-1};
template<class T>bool chmax(T&a,T b){if(a<b){a=b; return true;}return false;}
template<class T>bool chmin(T&a,T b){if(a>b){a=b; return true;}return false;}
template<class S>S sum(vector<S>&a){return accumulate(all(a),S());}
template<class S>S max(vector<S>&a){return *max_element(all(a));}
template<class S>S min(vector<S>&a){return *min_element(all(a));}
int sgn(const double&r){return (r>EPS)-(r<-EPS);} // a>0  : sgn(a)>0
int sgn(const double&a,const double&b){return sgn(a-b);} // b<=c : sgn(b,c)<=0

template<class T>void puta(T&&t){cout<<t<<"\n";}
template<class H,class...T>void puta(H&&h,T&&...t){cout<<h<<' ';puta(t...);}
template<class S,class T>void tf(bool b,S t,T f){if(b)puta(t);else puta(f);}
void YN(bool b){tf(b,"YES","NO");}
void Yn(bool b){tf(b,"Yes","No");}
void yn(bool b){tf(b,"yes","no");}
template<class S,class T>ostream&operator<<(ostream&os,pair<S,T>p){os<<"["<<p.first<<", "<<p.second<<"]";return os;};
template<class S>auto&operator<<(ostream&os,vector<S>t){bool a=1;for(auto s:t){os<<(a?"":" ")<<s;a=0;}return os;}
template<class S>auto&operator>>(istream&is,vector<S>&t){for(S&a:t)cin>>a;return is;}

/*他のライブラリを入れる場所*/
constexpr ll gcd(ll a,ll b){return b?gcd(b,a%b):a;}
constexpr ll lcm(ll a,ll b){return a/gcd(a,b)*b;}

int main(){
    cin.tie(0);
    ios::sync_with_stdio(false);
    
    ll n,c=0;
    cin>>n;
    
    ll a,b,h;
    
    range(i,1,n+1){
        if(i<10){
            c++;
        }else if(i<100){
            a=i%10;
            b=i/10;
            if(a==0) c+=0;
            else if(b>a) c+=2;
            else if(a==b) c+=3;
        }else if(i<1000){
            a=i%10;
            b=i/100;
            h=i/10%10;
            if(a==0) c+=0;
            else if(b>a) c+=22;
            else if(a==b) c+=5+2*h;
            else if(a>b) c+=2;
        }else if(i<10000){
            a=i%10;
            b=i/1000;
            h=i/10%100;
            if(a==0) c+=0;
            else if(b>a) c+=222;
            else if(a==b) c+=25+2*h;
            else if(a>b) c+=22;
        }else if(i<100000){
            a=i%10;
            b=i/10000;
            h=i/10%1000;
            if(a==0) c+=0;
            else if(b>a) c+=222;
            else if(a==b) c+=225+2*h;
            else if(a>b) c+=2222;
        }else if(i<200000){
            a=i%10;
            b=i/100000;
            h=i/10%10000;
            if(a==0) c+=0;
            else if(b>a) c+=2222;
            else if(a==b) c+=2225+2*h;
            else if(a>b) c+=2222;
        }
        
    }
    puta(c);
}


Measured memory_bytes: 256