#include<bits/stdc++.h>
//#include <boost/multiprecision/cpp_int.hpp>
//using namespace boost::multiprecision;

#define ll long long int
#define ld long double
#define bigint int64_t
#define vll vector<ll>
#define vpll vector<pair<ll,ll>>
#define mp make_pair
#define pb push_back
#define MOD 1000000007
#define flash ios_base::sync_with_stdio(false);cin.tie(NULL);
#define test ll t;read(t);while(t--)
#define all(v) v.begin(),v.end()
#define pll pair<ll,ll>

/*#include <ext/pb_ds/assoc_container.hpp> // Policy_based_Data_Structure 
#include <ext/pb_ds/tree_policy.hpp> 
using namespace __gnu_pbds;*/ 

#define forn(i,n) for(ll (i) = 0 ; (i) < (n) ; ++(i))
#define for1(i,n) for(ll (i) = 1 ; (i) <= (n) ; ++(i))
#define forr(i,n) for(ll (i) = (n)-1 ; (i)>=0 ; --(i))
#define forab(i,a,b,c) for(ll (i) = a ; (i) <= (b) ; (i)+=(c))

using namespace std;
template <typename T>
void read(T &x){
	cin >> x;
}
template <typename T , typename T0>
void read(T &x,T0 &y){
	cin >> x >> y;
}

template <typename T , typename T0 , typename T1>
void read(T &x,T0 &y,T1 &z){
	cin >> x >> y >> z;
}

template <typename T , typename T0 , typename T1 , typename T2>
void read(T &x,T0 &y,T1 &z,T2 &w){
	cin >> x >> y >> z >> w;
}

template <typename T , typename T0>
void read(pair< T , T0 > &p){
	cin >> p.fst >>p.scd;
}

template <typename T>
void read(vector< T > &oneD,ll n){
	forn(i,n)
	{
		ll x;
		read(x);
		oneD.push_back(x);
	}
}

template <typename T>
void read(T oneD[] , ll n){
	for(ll i=0;i<n;i++){
		read(oneD[i]);
	}
}

template <typename T>
void write(T &x){
	
	cout << x << " ";
}

template <typename T , typename T0>
void write(T &x,T0 &y){
	cout << x << " " << y << "\n";
}

template <typename T , typename T0 , typename T1>
void write(T &x,T0 &y,T1 &z){
	cout << x << " " << y << " " << z << "\n";
}

template <typename T , typename T0 , typename T1 , typename T2>
void write(T &x,T0 &y,T1 &z,T2 &w){
	cout << x << " " << y << " " << z << " " << w << "\n";
}

template <typename T , typename T0>
void write(pair< T , T0 > &p){
	write(p.fst);
	write(p.scd);
	cout << endl;
}

template <typename T>
void write(vector< T > &oneD){
	for(ll i=0;i<oneD.size();i++){
		write(oneD[i]);
	}
	cout << endl;
}

template <typename T>
void write(T oneD[] ,int n){
	for(ll i=0;i<n;i++){
		write(oneD[i]);
	}
	cout << endl;
}

template <typename T , typename T0>
void write(map< T , T0 > &mpp){
	for(auto it : mpp){
		write(it.fst);
		cout << ": ";
		write(it.scd);
		cout << "\n";
	}
	cout<<endl;
}

vll seive;
void Seive(){
	const ll maxn = 3000005;
	seive.resize(maxn);
	forn(i,maxn) seive[i] = i;
	seive[1] = -1;
	seive[0] = -1;
	forab(i,2,maxn,1) if(i == seive[i]) for(ll j = 2*i ; j < maxn ; j+=i) if(seive[j] == j) seive[j] = i;
}

ll extended_GCD(ll a , ll b , ll &x , ll &y){
	if(a == 0){
		x = 0;
		y = 1;
		return b;
	}
	ll x1 , y1;
	ll gcd = extended_GCD(b%a , a , x1 , y1);
	x = y1 - (b/a)*x1; 
	y = x1;
	return gcd;
}

ll modinv(ll a , ll mod = MOD){
	ll x , y;
	extended_GCD(a , mod , x , y);
	if(x < 0) x += mod;
	return x;
}

//Chinese Remainder Theoram
ll find_x_CRT(ll num[],ll rem[],ll n)
{
	ll pro=1;
	forn(i,n)
	pro*=num[i];
	ll res=0;
	forn(i,n)
	{
		ll pp = pro/num[i];
		res+=(rem[i]*modinv(pp,num[i])*pp);
	}
	res%=pro;
	return res;
}

ll power(ll a, ll b, ll m = MOD) {
	a%=m;
    ll res = 1;
    while (b > 0) {
        if (b & 1)
            res = res * a %m;
        a = a * a %m;
        b >>= 1;
    }
    return res;
}

ll powe(ll a, ll b, ll m = MOD) {
    ll res = 1;
    while (b > 0) {
        if (b & 1)
            res = res * a;
        a = a * a;
        b >>= 1;
    }
    return res;
}

ll gcd(ll a, ll b)
{
	if (a == 0)
		return b;
	return gcd(b % a, a);
}

string getString(char x) 
{ 
    string s(1, x); 
    return s;    
} 

//typedef tree<ll, null_type, less<ll>, rb_tree_tag,tree_order_statistics_node_update> index_set
int main()
{
	flash;
	ll n;
	read(n);
	ll ans = 0;
	forab(i,1,n,1)
	{
		ll y = i,c=0;
		while(y!=0)
		{
			y/=10;
			c++;
		}
		if(c%2)
		ans++;
	}	
	cout<<ans;
	return 0;
}

Measured memory_bytes: 256