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 solve():
	n = int(input())

	orders = 0
	nc = n
	while nc:
		orders += 1
		nc //= 10

	ans = orders * (1+n-10**(orders-1))

	for i in range(1,orders):
		diff = 10**(i) - 10**(i-1)
		ans += diff*i

	return ans

print(solve())