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.
c = input()
b = len(c)
sume = 0
a = 9
d = 1
while b>1:
    sume += a*d
    a *= 10
    d += 1
    b -= 1
r = int(c)

if len(c) == 1:
    print(c)
else:
    r -= (a / 10)
    sume += (r*d)
    sume = int(sume)
    print(sume)

