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.
s=input()
n=int(s)
l=len(s)-1
ans=0
while(l):
    num=int("9"*l)
    ans+= (n-num)*(l+1)
    n=num
    l-=1
print(ans+n)