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()
aux = list(numero)
tamanho = len(aux)

numero = int(numero) 

soma = 0
fator = 9
acc = 0
mult = 0
for i in range(1, tamanho, 1):
  mult = i
  acc += fator * pow(10, i - 1)
  soma += (fator * pow(10, i - 1)) * mult

resto = numero - acc
soma += resto * (mult + 1)

print(soma)
  	 		 	 		   	 		 			  	  	 		