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.
#O(log10n)
n = int(input())
digits = len(list(str(n)))
total = 0
for x in range(digits-1):
	subtract = (10**x) * 9
	total += subtract * (x+1)
	n = n - subtract
total += n* digits
print(total)