Vanya got an important task — he should enumerate books in the library and label each book with its number. Each of the *n* books should be assigned with a number from 1 to *n*. Naturally, distinct books should be assigned distinct numbers.

Vanya wants to know how many digits he will have to write down as he labels the books.
The first line contains integer *n* (1 ≤ *n* ≤ 10<sup class="upper-index">9</sup>) — the number of books in the library.
#include <bits/stdc++.h>
#define ll long long
using namespace std;

int main()
{
    string s;
    int x=0, res=0;
    ll len=0;
    cin >> s;

    len = s.length();

    for(int x=1; x<len; x++)
    {
        string h="9", stuff(x-1, '0');
        h = h + stuff;
        stringstream geek(h);
        geek >> x;

        res += x;
    }


    //cout << s[len-1];
    if(len == 1){
        cout << s;}
    else{
    res += (s[len-1]-'0'+ 1) * len;
    cout << res;}


    return 0;
}