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())
s = str(n)
t = '9'*(len(s)-1)
t = int(t)
c = 0
c += len(s)*(n-t)
n -= (n-t)
s = str(n)
p = 9
for i in range(1,len(s)+1):
    c += p*i
    p *= 10
print(c)