Fortune Telling Collection - Free divination - A math problem

A math problem

There are ways to win, but it depends on how many coins there are. In the case of a large number of coins, if there are odd coins, you only need to take two for the first time, then the other party will take a few for yourself, and finally take the rest at one time 1 or 2 or 4. If there are even coins, take 1 first, and then the other party takes a few.