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())
z=10
r=1
p=1
k=0
while n>z :
    k=k+(z-r)*p
    r=r*10
    z=z*10
    p=p+1
if n//z==1 :
    print(k+(n-r)*p+p+1)
else :
    print(k+((n-r)+1)*p)
    
    
    
