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()) 
#n, m = map(int, input().split())
#s = input()
#c = list(map(int, input().split()))
k = len(str(n)) - 1
l = (n - 10 ** k + 1) * (k + 1)
while k > 0:
    k -= 1
    l += (10 ** k ) * 9
print(l)