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.
a=[9,99,999,9999,99999,999999,9999999,99999999,999999999]
n=input()
i=0
j=1
s=0
if(len(n)>1):
	while(j<=len(n)-1):
		s=s+a[i]*j
		j=j+1
	q=int(n)-a[i]
	q=q*(j)
	print(q+s)
else:
	print(n)