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.
books = input()
L = len(books)
if L == 1:
    print(books)
elif L == 2:
    print(L*int(books) - 9)
elif L <= 9:
    print(L*int(books) - int("1"*(L-1) + "0" + str(10-L)))
else:
    print(L*int(books) - int("1"*(L+1)))