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You're over thinking it :) You're already storing the element your wanting into a variable called "num". Then you're grabbing the text inside of it. Here's what you do.

1. redefine num to be the text of the element.
2. do this for every other element you want to update the text for.
3. then add all of the values of those inside the function.
4. save that in a var called total and update that in the area where the total should be
5. make sure to start total at 0 every time the function runs or you will compound the value

note you'll want to declare all of your variables globally and then update them locally. Don't declare any variables locally or they will come back undefined when you try to update them in other functions