## More Or Less

### Instructions

Create 4 functions

- `more` that takes 1 argument and add 1 to it
- `less` that takes 1 argument and substract 1 to it
- `add` that takes 2 arguments and add them
- `sub` that takes 2 arguments and substract them

### Notions

- [nan-academy.github.io/js-training/examples/functions](https://nan-academy.github.io/js-training/examples/functions.js)
- [nan-academy.github.io/js-training/examples/primitive-and-operators](https://nan-academy.github.io/js-training/examples/primitive-and-operators.js)