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().strip())
length = len(str(n)) - 1

temp = n - (10**length - 1)
total = (length+1) * temp
while length:
    total += (9*length*(10**(length-1)))
    length -= 1

print(total)
