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 = str(input())
x = len(n) - 1
ans = 0
for i in range(1, x+1):
    ans += (10**i - 10**(i-1))*i

ans += (int(n) - (10**x-1))*(x+1)
print(ans)





