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()

t = len(n)-1

ans = 0

i = 1
while i <= t:

	ans = ans + i*9*pow(10,i-1)
	i = i + 1


if t > 0:
	k = int(n) - int("9"*(t))
else:
	k = int(n)

print(ans+k*(t+1))