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())

c=0
l=len(str(n))
if l==1:
    print(1)
else:
    k=1
    while k<l:
        c+=(pow(10,k)-pow(10,k-1))*k
        k=k+1
    c+=(n-pow(10,l-1)+1)*l
    print(c)