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 = int(input())
nums = 0
for i in range(1, len(str(n)) + 1):
	if n > int('9' + '0'*(i-1)):
		nums += int('9' + '0'*(i-1)) * i
		n -= int('9' + '0'*(i-1))
	else:
		nums += n * i
		break
print(nums)