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.
def test():
	n = int(input())
	if n < 10:
		print(n)
		return ''
	ans = 9
	s = 10
	while s * 10 < n:
		ans += (s * 10 - s) * len(str(s))
		s *= 10
	while s <= n:
		ans += len(str(s))
		s += 1
	print(ans)
t = 1
while t:
	t -= 1
	test()