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.
def inp():
    return(int(input()))
def inlt():
    return(list(map(int,input().split())))
def insr():
    s = input()
    return(list(s[:len(s) - 1]))
def invr():
    return(map(int,input().split()))
    

n = inp()
s = str(n)
total = 0
for i in range(len(s)):
    if i+1 < len(s):
        total += (pow(10,i+1)-pow(10,i)) * (i+1)
    else:
        total += len(s) * (n-pow(10,i)+1)
    

print(total)
	  			    	 	  		  	  		 				