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.
x=(input())
if int(x)<10:
    print(x)
else:
    d=0
    p=len(x)
    while p>1:
        d+=p*(int(x)-int(((p-1)*"9")))
        x=int(((p-1)*"9"))
        p-=1
    print(d+9)    