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.
x = int(input()) 
ptp = ''
p=len(str(x))-1
t = '1' + '0' * p
an=0

while(x>0):
	at = ((int(t) - x) * -1)
	an += (((int(t) - x) * -1) +1) * len(str(x))
	x -= at + 1
	t = '1' + '0' * (len(str(x))-1)

print(an)