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())
length = len(str(n))
d = {}
total_sum = 0
for i in range(length):
    d[i + 1] = 9 * 10 ** i * (i + 1)
for j in range(length - 1):
    total_sum += d[j + 1]
total_sum += (n - 10 ** (length - 1) + 1) * length
print(total_sum)
