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.
x = int(input())

nine = 9
sum = 0
low = 0

for i in range(1, 9):
    if (low * 10) + 9 < x:
        sum = sum + (nine * i)
    else:
        sum = sum + ((x - low) * i)
        break

    nine = nine * 10
    low = (low * 10) + 9

print (sum)