A camp counselor wants to make a smoothie for a group of children using at most 75 pounds of fruit consisting of oranges, cherries, and blueberries. Each pound of oranges contains 230 calories, 3 mg of sodium, and 4 g of protein. Each pound of cherries contains 260 calories, 7 mg of sodium, and 5 g of protein. Each pound of blueberries contains 250 calories, 5 mg of sodium, and 3 g of protein. How many pounds of each fruit should she use in order to minimize the number of calories, keep the amount of sodium less than 251 mg, and have the smoothie contain at least 300 g of protein? How many calories will the smoothie contain?