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.
a=[0,9,108,1107,11106,111105,1111104,11111103,111111102,1111111101]
n=int(input())
x=n
c=0
while n>1:
    n/=10
    c+=1
print(c*x-a[c-1])