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.
from sys import stdin
from collections import Counter,defaultdict,deque
import sys
import math,os
import operator
import random
from fractions import Fraction
import functools
import bisect
import itertools
from heapq import *
import copy


n = int(input())
ans = 0
while n!=0:
    l = math.floor(math.log(n,10))
    ans += (n-(10**l)+1)*(l+1)
    n = 10**l-1
print(ans)


