There is a stack of 100 cards held by the pony, and he operates from the top one in the following order: discard the top first card and put the next card at the bottom of the stack ． Then discard the original third card and put the next card at the bottom. Do this repeatedly until there is only one card left in the hand, so which card is the remaining card in the original stack?
有一摞100张卡片由小马拿着，他从最上面的一张开始按如下的顺序进行操作：把最上面的第一张卡片舍去，把下一张卡片放在这摞卡片的最下面．再把原来的第三张卡片舍去，把下一张卡片放在最下面．反复这样做，直到手中只剩下一张卡片，那么剩下的这张卡片是原来那一摞卡片的第几张？
<gadget id="calculator">2 ** 6</gadget>
<output>64</output>

<gadget id="calculator">100 - 64</gadget>
<output>36</output>

<gadget id="calculator">36 * 2</gadget>
<output>72</output>

<result>72</result>