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())
a=len(n)
s=0
k='9'
if int(n)<=9:
    print(n)
else:
    s+=9
    for i in range(2, a):
        s+=(int(i*k)-10**(i-1)+1)*i
    s+=(int(n)-10**(a-1)+1)*a
    print(s)