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())
if n<10:
    print(n)
else:
    ans=int(len(str(n))-1)
    ans0=int(len(str(n)))
    ans1=(n%10**ans+1)*(ans+1)
    ans2=(n//10**ans-1)*ans0*10**ans
    j=1
    h=9
    ans3=0
    for i in range(len(str(n))-1):
        ans3 +=j*h
        h *=10
        j +=1
    print(ans1+ans2+ans3)
