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.
def countDigit(n):
    count = 0
    while n != 0:
        n //= 10
        count += 1
    return count
n =int(input())
d = countDigit(n)
s = 0
for i in range(1,d):
    s=s+9*(i*pow(10,i-1))
sum = s+d*(n-pow(10,d-1)+1)
print(sum)
