Water Filling

Chef has three water bottles. At any point, if at least two of them are empty, she will fill them up. But if at most one bottle is empty, she will wait, and not fill them up now. You are given three integers - $B_1, B_2,$ and $B_3$. \ If $B_1 = 1$, it means that the first bottle is full. \ If $B_1 = 0$, it means that the first bottle is empty. \ Similarly, $B_2$ denotes whether the second bottle