Can I eat Total cereal and still take a multivitamin?

I want to buy Total Cranberry Crunch Cereal and Rhino Gummy Bear Vitamins from the store today. I guess what I'm trying to ask is will I be taking in more vitamins than I should? Would eating broccoli, peas, and carrots also be a problem. I usually eat junk food, so I'm a bit clueless to anything concerning healthy eating.