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.
#BY hassan alkanash
import math
sum=0
fac=1
n=int(input())
while(n!=0):
  str1=str(n)
  sum+=(len(str1))
  if n<=10:
      fac*=1
      sum+=(n-(fac))*(len(str1)-1)
  else:  
      fac*=11
      sum+=(n-(fac))*(len(str1)-1)
  n/=10


print(sum)