A box of chocolate beans, eat half of the total number on the first day, and eat the remaining half every day after that, after eating for 4 days, there are only 2 left. How many chocolate chips are there in this box?
一盒巧克力豆，第一天吃了总数的一半，以后每天吃剩下的一半，共吃了4天，还剩2颗．这盒巧克力豆原来有多少颗？
<gadget id="calculator">2 * 2 * 2 * 2 * 2</gadget>
<output>32</output>

<result>32</result>