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.
# coding=utf-8


if __name__ == '__main__':
    n = int(input())
    l = len(str(n))
    upper = 0
    for i in range(l):
        upper += 9 * pow(10, i) * (i + 1)
    miss = (int('9' * l) - n) * l
    print(upper - miss)
