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())
List = [0,9,90,900,9000,90000,900000,9000000,90000000,900000000,9000000000]
i = 1
count = 0
while n>List[i]:
    count += List[i]*i
    n -= List[i]
    i+=1
count += n*i
print(count)