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.
from sys import stdin, stdout
n=int(stdin.readline())
h=str(n)
a=[]
a.append(9)
c=1
for i in range(1,19):
       c*=10
       a.append((a[i-1]+(9*c)))
l=len(h)
b=[]
b.append(0)
c=10
for i in range(1,19):
       b.append(c)
       c*=10
s=a[l-2]
if(n%10==0):
       s+=len(h)
else:
       s+=((((n-b[l-1])+1)*(l)))
print(s)
