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.
book= input().strip('\n')
books=int(book)
x='1'
for i in range(0,len(book)-1):
    x=x+'0'
y=0
if int(books)<10:
    y=books
else:
    y=9+len(book)*(books-int(x)+1)

    for i in range(1,len(x)-1):
        y=y+(len(book)-i)*(int(x[:-i])*9+9)
print(y)


