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 <= 9:
    print(n)
    quit()
length = len(str(n))
num = 9
ans = 0
while len(str(num)) < length:
    ans += num * len(str(num))
    num = int(str(num) + "0")
ans += (int(str(n)[1:]) + 1) * len(str(num))
print(ans)


