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.
q=int(input())
n=len(str(q))
t=0
x=0
for i in range(n-1):
    t=t+9*pow(10,i)*(i+1)
    x = x + 9 * pow(10, i)
m=(q-x)*n+t
print(m)
