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())
x, y, k = n, 0, 0
cnt_all = 0
while x > 0:
    k += 1
    z = 10 * y + 9
    cnt_all += k * (z - y)
    y = z
    x //= 10

cnt_intersec = k * (z - n)
print(cnt_all - cnt_intersec)
