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.
n= input()
length=len(n) 
length = int(length)

tensmultiple= 10**(length-1) 
z = int(n)-tensmultiple 
digits= (z+1)* length 

length=length - 1 
 
while length != 0:

  tensmultiple = 10 ** (length-1)
  y=(( 10**length)- tensmultiple )
  digits = digits + ( y * length )
  length = length-1 
  
print (digits) 