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.
import math

n = int(input())
p = 1
while True:
	if n < pow(10,p):
		break
	p += 1
first_term = p * (n + 1)
s = 0
for i in range(p):
	s += pow(10,i)

# print(first_term)
# print(s)
print(first_term-s)