How to force addition instead of concatenation

How to force addition instead of concatenation

I'm trying to add all of the calorie contents in my javascript like this:

total = parseFloat(myInt1 + myInt2 + myInt3);
$('#response').append(total);

Instead of adding the variables they get concatenated. I've tried using parseInt, parseFloat, and Number but I still just get concatenation and not addition. Please look at the view source at http://maureenmoore.com/momp_112412/121912_800.html