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.
a = input()
b = len(a)
d = int(a)
c = 0;s = '';t = 0
s = (b-1)*'9'
t = int(s)
c += b*(d-t)
d = d-t
c = c + int((b-1)*'9')
print(c)

	   	 	 		 	 	 				    	   	 		