How many expiations are required for breaking the oath: "By God, I will not eat the cake, and by God, I will not participate in its making, and by God, I will not fast an expiation for an oath until I eat from it"?

It appears that the questioner swore two oaths: the first not to eat cake, and the second not to expiate the first oath. If he ate the cake, expiation is due from him, and then another expiation becomes binding upon him for not expiating his oath. Therefore, two expiations are binding upon him. Each expiation involves feeding ten needy persons or clothing them, or emancipating a slave. If he is unable, then fasting three days for each expiation.