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.
def countDigits(n):
    ans = 0
    while n > 0:
        ans += 1
        n //= 10
    return ans

books = int( input().strip() )
d = countDigits( books )
if d == 1:
    ans = books
else:
    aux = [0] * d
    aux[1] = 9
    for i in range(2, d):
        aux[i] = aux[i-1] * 10 + 9
    ans = 0
    for i in range(d):
        ans += (aux[i] - aux[i-1]) * i
    ans += (books - aux[d-1]) * d
print( ans )