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.
'''input
13
'''
from math import log10
n = int(input())
t, x = 0, 0
while 10**x <= n:
	t += (10**x - 1)
	x += 1
x -= 1
t += ((n % 10**x)+1) * len(str(10**(x)))
if t == 1:
	print(n)
else: 
	print(t)








