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=list(input())
k=len(a)
t=pow(10,k-1)
total=((int("".join(a[:k]))-t)+1)*k
i=k-2
while i>=0:
	t=pow(10,i+1)-1
	b=pow(10,i)
	total=total+((t-b)+1)*(i+1)
	i=i-1
print(total)