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(raw_input())
ans = 0
for l in range(1, 11):
    if (l == len(str(n))):
        ans += (n - 10**(l-1) + 1) * l
    elif (l < len(str(n))):
        ans += (9 * 10**(l - 1)) * l
    else:
        break
 
print ans