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.

import math
from collections import Counter
import bisect

n = input()
ans = 0
for i in range(len(n) - 1) :
    ans += 9 * (10 ** i) * (i + 1)
ans += (int(n) - 10 ** (len(n) - 1) + 1)* (len(n))
print(ans)