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())

res = 0
akt = n

while True :
    below = 0
    while below < akt :
        below *= 10
        below += 9
    below -= 9
    below  = below // 10
    res += len ( str (akt) ) * ( akt - below )
    akt = below
    if akt == 0: break

print( res )