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())
l=len(str(n))
cnt=0
i=1
while i<l:
    z=9*(10**(i-1))*i
    cnt+=z
    i+=1
y=(10**(l-1))-1
x=n-y
cnt+=(l*x)
print(cnt)