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.
s = input()
c = 0
n = len(s)
for i in range(1, n):
    c += int("9" + "0" * (i - 1)) * i
c += (int(s) - 10 ** (n - 1) + 1) * n
print(c)
