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.
#link: https://codeforces.com/problemset/problem/552/B

from sys import stdin, stdout

if __name__ == "__main__":
    digits = 0
    n = int(stdin.readline())
    currentlength = -1
    while len(str(n)) != 1:
        currentlength = len(str(n))
        n1 = currentlength
        which_ten = "1"
        while n1-1:
            n1 -= 1
            which_ten += "0"
        digits += (n-int(which_ten) + 1) * currentlength
        n = int(which_ten) - 1
    print(digits + n)            

