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()
tamanho = len(n)
ans = 0
while tamanho > 0:
    base10 = 10 ** (tamanho - 1)
    n = int(n)
    menos = (n - base10) + 1
    ans += menos * tamanho
    n -= menos
    tamanho -= 1
print(ans)
 			 	 	 	 							  			 	 	 	 	