A and B are going to explore the desert. They walk 20 kilometers deep into the desert every day. It is known that each person can carry food and water for one person at most for 24 days. If some food is not allowed to be stored on the way, then, among them How many kilometers can one person go deep into the desert? (The last two are required to return to the starting point)
A、B两人要到沙漠中探险，他们每天向沙漠深处走20千米，已知每人最多可以携带一个人24天的食物和水，如果不准将部分食物存放于途中，那么，其中一人最远可以深入沙漠多少千米．(要求最后两人都返回起点)
<gadget id="calculator">24 - 8</gadget>
<output>16</output>

<gadget id="calculator">8 - 8</gadget>
<output>0</output>

<gadget id="calculator">16 + 0</gadget>
<output>16</output>

<gadget id="calculator">16 / 2</gadget>
<output>8</output>

<gadget id="calculator">8 + 8</gadget>
<output>16</output>

<gadget id="calculator">20 * 16</gadget>
<output>320</output>

<result>320</result>