Assume that you have 22 slices of pizza and 7 people that are going to share it. There's been some arguments among your friends, so you've decided to only give people whole slices. Your pet dog Fido loves pizza. Write a Python expression with the remainder operator that calculates how many pizza slices will be left over for your dog after serving just whole slices to 7 people. Assign the result of that expression to fidos.