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.
number=int(input())
t=len(str(number))
count=number%10
if number<10:
    print(count)
elif t==2:
    print(9+(number+1-10)*2)
else:
    count=9
    j=2
    while j<t:
        count=count+((pow(10,j-1))*9*j)
        print(count)
        j+=1
    count=count+(number+1-(pow(10,j-1)))*j
    print(count)