Shoplex is a crowd funding shopping site, which provides online sales service for various goods。 On Shoplex, all items are divided into a number of shares, each of which is represented as a bid number。 People spend one or more bids in exchange for the same amount of bid numbers。 When all the shares of one item were sold, a "winning bid number" will be chosen according to the "Calculation Rule of Winning Number"。 The owner of that winning bid number wins the item。