#include <iostream>
#include <cmath>
#include <algorithm>
#include <vector>
#include <cstring>
#include <deque>
#include <time.h>
#include <stack>
#include <stdio.h>
#include <map>
#include <set>
#include <string>
#include <fstream>
#include <queue>
#define mp make_pair
#define pb push_back
#define PI 3.14159265358979323846
#define MOD 1000000007
#define INF ((ll)1e+15)
#define x1 fldgjdflgjhrthrl
#define x2 fldgjdflgrtyrtyjl
#define y1 fldggfhfghjdflgjl
#define y2 ffgfldgjdflgjl
typedef long long ll;
using namespace std;
ll i,n,x,m,k,ans;
int main()
{
    cin >> n;
	x = n;
	while (x)
	{
		x /= 10;
		m++;
	}
	ans = n*m + m - 1;
	k = 1;
	for (i = 0; i < m-1; i++)
	{
		k *= 10;
		ans -=k;
	}
	cout << ans << endl;
	return 0;
}
 

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