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()
if int(numero) > 10:
  a = ""
  i = 1
  aux = 9
  while True:
    if i > len(numero)-1:
      break
    if i == len(numero)-1:
      a += "9"
      aux += (int(numero)-(int(a)))*(i+1)
    if i < len(numero)-1:
      a += "9"
      aux+= ((10**(i+1)) - (int(a))) * (i+1)
    i+=1
else:
  aux = int(numero)
  i = 0

print (aux)