Congratulation for successful crowd sale !!

One question ;
Crowdsale planned for 400,000,000 pls, but some pls still remaining.
Any idea for remaining pls

For example, if during the first week, 3000BTC is received, the crowdfunding will be ended with 390 million PLS distributed. Then the remaining 10 million PLS will be given to all that have participated in the crowdfunding, making 1 BTC with 133,333PLS of return.
If in the end, the fund that is collected at the end of the 28-day raising period is less than 3000BTC, there will be more PLS left to give to the investors who have participated.