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.
import sys
from math import log
input = sys.stdin.readline
x = int(input())
y = int(log(x,10))+1
li = [0,1,11,111,1111,11111,111111,1111111,11111111,111111111]
print(y*(x+1)-li[y])

