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 = input()
great = '1' + '0' * (len(n) - 1)
ans, great = len(n) * (int(n) - int(great) + 1), int(great)

for i in range(len(n) - 1, 0, -1):
    ans += i * (great - 1)
    great //= 10
print(ans)
