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 = input()
o = len(n)-1
n = int(n)

k = pow(10, o)-1
a = (n-k)*(o+1)

while (o > 0):
    a += (pow(10, o)-pow(10, o-1))*o
    o -= 1

print(a)