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()
l = len(n)
ans = 0
prev = 0
p_sum = 0
for i in range(l):

    d = (10**(i+1) - 1)
    if(int(n) <= d):
        ans+= (int(n) - prev)  * (i+1)
        break
    else:
        ans = d*(i+1) - prev*i
    prev = d



print(ans)


