Four friends, Emily, Fred, Gary, and Helen, are sharing a large pizza. They take turns eating a fraction of what remains: first Emily eats one-third of the pizza, then Fred eats one-third of the remainder, then Gary eats one-third of what is left, then Helen eats one-third of what is then left, and then back to Emily, and so on. This continues until the pizza is gone. About what fraction of the original pizza does Emily eat in total?