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 = int(input())
numbers = [10 ** i for i in range(10)]
print(numbers)
i = 0
count = 0
while n:
    if n >= numbers[-1-i]:
        n -= 1
        count += len(str(numbers[-1-i]))
    else:
        i += 1
print(count)
