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())
if n<=9:
    print(n)
else:
    s=str(n)
    l=len(s)
    s1=0
    lst=[9,90*2,900*3,9000*4,90000*5,900000*6,9000000*7,90000000*9,900000000*9]
    s1+=sum(lst[:l-1])
    s1+=l*(n-10**(l-1)+1)
    print(s1)