You can use one slice of bread, cut it in half, and use the halves to make a sandwich. Or you can cut it in quarters. Or eighths. Or sixteenths. Or thirty-seconds. Or sixty-fourths. Or one-hundred twenty-eighths. Or two-hundred fifty-sixths. It depends upon how hungry you are. Cutting it into two-hundred fifty-sixths would give you one hundred twenty-eight sandwiches, or enough for a wake.