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)
elif n<100:   
   print(9+(n-9)*2
elif n<1000:   
   print(189+(n-99)*3
elif n<100:   
   print(2889+(n-999)*4
elif n<100:   
   print(38889+(n-9999)*5
elif n<100:   
   print(488889+(n-99999)*6
elif n<100:   
   print(5888889+(n-999999)*7
elif n<100:   
   print(68888889+(n-9999999)*8
elif n<100:   
   print(788888889+(n-99999999)*9
elif n==1000000000:   
   print(8888888899)
   		   	 					 				 	  	 		 	