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.
books_in_the_library = int(input())

if len(str(books_in_the_library)) == 1:
    print(books_in_the_library)
else:
    digits = 9
    for i in range(2, len(str(books_in_the_library))):
        digits += i * 90
    digits += (books_in_the_library - int('1' + '0' * (len(str(books_in_the_library)) -1)) + 1) * len(str(books_in_the_library))
    print(digits)
