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.

def find_numbers_count(number , rank):
    res = number * rank
    it = rank
    while it != 1:
        it-=1
        res = res - (pow(10 , it) - 1)

    return res




if __name__ == "__main__":
    number = input()
    rank = len(number)
    print(find_numbers_count(int(number) , rank))
