Suppose the quantity of bread is 1, 2, 3, put 1, 2 first, bake one side, turn 1 over, take out 2, put in 3, bake one side, take out 1, put in 2 and bake the other side, and turn it over for 3 times, and it is finished. Coat both sides first, and then coat others when baking. Then 30 * 3+12 * 2 =114.