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 = input()
b = int(n)
if len(n)>1:
	z = (b-int("9"*(len(n)-1)))*len(n)
	w = int("9"*(len(n)-1))
	for i in range(1,len(n)-1):
		q ="9"*i
		w-=int(q)
	print(z+w)
else:
	print(n)