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.
num = int(input())
total = 0

for x in range(1, 11):
    if (x == len(str(num))):
        total += (num - 10**(x - 1) + 1) * x
    elif (l < len(str(n))):
        total += (9 * 10**(x - 1)) * x
    else:
        break

print(total)
