It's 1/3 superfree which you should have.
Superfree foods are listed on page 11 and 12 of the food optimising book, if you have one, and are all fruit and vegetables with the exception of potatoes, parsnips, sweetcorn, broad beans, peas, and avocado (I may have missed one out, I usually do!).
Baked beans are free, but they are not superfree.
Basically the idea is that if you pile your plate with vegetables, and have fruit for dessert and snacks, you won't be eating so much of the higher-calorie food, and you will also be getting loads of vitamins and minerals.