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=str(input())
n1=int(n)
n2=list(n)
i=len(n2)
c=0
while i>=2:
    t1=n1-10**(i-1)
    c+=(t1+1)*i
    n1=10**(i-1)-1
    i-=1
if int(n)<=9:
    c+=int(n)
else:
    c+=9
print(c)

