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())
sum1=0
weishu=len(str(n))
num1=1
if weishu>1:
    while num1<weishu:
        sum1+=num1*9
        num1+=1
    number=n-10**(weishu-1)+1
    sum1+=weishu*number
else:
    sum1=n
print(sum1)


    
    

