Javascript help

**Haarek**

How do I make it possible for a user of the site to input the values?
I get I have to use <input> with a form but I can't get the js to reference the name, id or action.
Is php the solution?

Code:
<html><body><script>

var height = 140

var storySize = 2.8

var getStories = function(storyCount){

    storyCount = height / storySize

    console.log("The height of the building is " + height + "m")

    console.log("The building has " + Math.trunc(storyCount) + " stories")

    console.log("the height of each story is " + storySize +"m")

getStories()

</script>

</body>

</html>

If I can get help solving this I will give whoever solves it 150,000$ ig
I have tried 2 days now on and off.