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.
numero = input()

cont = 0
tamanho = len(numero)
numero = int(numero)
if(numero  < 10):
    print(numero)
else:  
    cont += int("{}{}9".format(tamanho-1 if tamanho > 2 else "", "8" * tamanho-2 if tamanho > 2 else ""))
    cont += (numero - int("9" * (tamanho - 1))) * tamanho
    print(cont)

				 				 	    	      		  			 	