After the lottery, all winning funds and all expenses are removed, and the remaining undistributed money is reserved for the next lottery, which is called the prize pool. The first prize is accumulated, the less the first prize is won, the more the next prize pool funds are accumulated, the more the prize pool funds are, the higher the amount due for each note of the next first and second prizes, the less the prize pool funds are, and the more the winners are distributed.