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())

nrDigits = 0
limit1 = 0
limit2 = 9
digit = 1

while n > limit2:
    nrDigits += (limit2 - limit1) * digit

    limit1 = limit2 + 1
    limit2 = limit2*10 + 9
    digit += 1

nrDigits += (n - limit1 + 1) * digit

print(nrDigits)