#898. Digit sum in base 9
You get n. Write n in base 9 and find the sum of its digits with a function `digit_sum(n, base)`.
### Input
One integer n (0 ≤ n ≤ 10⁹).
### Output
A number.
Examples
Input
96890440
Output
32
Input
499162291
Output
35
💡 You can solve it with Python, JavaScript or blocks. Read the input line by line with input(). Don't print a question (like input("Number: ")). Print exactly what the output asks for, nothing more.