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.
if __name__ == '__main__':
    n = input()
    res = 0
    k = 1
    max = int('1' + '0' * (len(n) - 1))
    for count in range(1, len(n)):
        res += count * k * 9
        k *= 10
    res += (int(n) - max + 1) * len(n)
    print(res)
