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())
x = 0
lll = '1'*(len(list(str(n)))-1)
for i in range(1, len(list(str(n)))):
    x += i*9*10**(i-1)
if len(list(str(n))) != 1:
    print(x+(i+1)*(n-9*int(lll)))
else:
    print(n)