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())
k = len(str(n))
h = 9
c=0
for i in range(1,k):
	c += h*i
	h = h*10 
if k==1:
	print(n)
else:
	c += k*(n-int((k-1)*'9'))
	print(c)