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.
t=int(input())
val=9
digit=1
s=0
val1=9
while digit<=len(str(t))-1:
    s+=digit*val
    digit+=1
    val*=10
    val1=(val1*10)+9
d=t-(val1//10)
p=d*digit
print(s+p)
