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())
result = 0
curr = 1
curr_exp = 1
for i in range(len(str(n)) - 1):
    if i == 0:
        numbers = curr_exp * 9
    else:
        numbers = (curr_exp * 9) - 1
    result += curr * numbers
    curr_exp *= 10
    curr += 1
result += curr * (n - curr_exp + 1)
print(result)