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=int(input())
a=str(n)
l=len(a)
if(l==1):
  print(n)
else:
  count=(n-((10**(l-1))-1))*l
  if l-1!=1:
    for i in range(l-1,1,-1):
      count=count+i*((10**i-1)-(10**(i-1)-1))
  count=count+9
  print(count)