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 = input()
a = list()
numbers = [9,189,2889,38889,488889,5888889,68888889,788888889,8888888889]

if(len(n) > 1):
        for i in range(len(n)-1):
                a.append("9")
        a = int("".join(a))
        cnt = len(n) * (int(n) - a)
        cnt = cnt + numbers[len(n)-2]
else:
        cnt = n

print(cnt)
