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.
# coding=utf-8
n=int(input())
if n<10:
 print(n)
if n<100:
 print(9+(n-9)*2)
if n<1000:
 print(189+(n-99)*3)
if n<10000:
 print(2889+(n-999)*4)
if n<100000:
 print(38889+(n-9999)*5)
if n<1000000:
 print(488889+(n-99999)*6)
if n<10000000:
 print(5888889+(n-999999)*7)
if n<100000000:
 print(68888889+(n-9999999)*8)
if n<1000000000:
 print(788888889+(n-99999999)*9)
elif n=1000000000:
 print(8888888899)
	 	  	 		  	 		 	   			    	 	