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())
ch=str(n)
x=len(ch)
if x==1:
    print(n)
else:
    l=0
    while x>1:
        x-=1
        t = pow(10, x)-1
        c=n-t
        l=l+(c*(x+1))
        n=n-c
    print(l+9)
