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.
num = int(input())
sum =0
j=1
while num>=pow(10,j):
    sum+=pow(10,j)-pow(10,j-1)*j
    j+=1
sum+=(num-pow(10,j-1)+1)*j
print(sum)
 	 		   		 				 		 	    		 	 		