Thanks corrected

You definitely went wrong with not using code blocks when posting code :D

Please see https://docs.codewars.com/references/markdown#code-block

You're modifying your inputs, and you deserve everything you get.

Please learn to properly markup your posts.

Upper limit of your loop can be greatly reduced. There's no need to loop all the way up to num.

Not a kata issue, read the description again:

NOTE on performance: There are no fancy optimizations required, but still the most trivial solutions might time out. Numbers go up to 2^31 (or similar, depends on language version). Looping all the way up to n, or n/2, will be too slow.

Yes, you need to optimize your code.

Thanks, I understood my mistake

Your code fails for 143.

Your code is wrong, not a kata issue. Read this: https://github.com/codewars/codewars.com/wiki/Troubleshooting-your-solution