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())
if n < 10:
    print(n)
elif n < 100:
    print(9 + 2*(n-9))
elif n < 1000:
    print(9+2*(91)+3*(n-99))
elif n < 10000:
    print(9+2*(91)+3*(901)+4*(n-999))
elif n < 100000:
    print(9+2*(91)+3*(901)+4*(9001)+5*(n-9999))