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())
p, c = 1, min(n, 9)
count = 0
while c <= n:
    count += (c - p + 1) * len(str(c))
    p = c + 1
    c = min(n, int('9' + str(c)))
    if c == n:
        count += (c - p + 1) * len(str(c))
        break
print(count)
