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,r,b = int(input()),0,0
while n >= 10**b:
    r += (b+1)*(min(n, 10**(b+1)-1)-10**b + 1)
    b += 1
print(r)
