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
n = eval(input())
nn = n
cnt = 0
while nn != 0:
    cnt += 1
    nn //= 10
'print(cnt)'
now = 9
pre = 0
ans = 0
for i in range(1, cnt):
    ans += i*(now-pre)
    pre = pre*10 + 9
    now = now*10 + 9
re = n - pre
ans += re*cnt
print(ans)
  	 	  		 	 		   							  	   	