Remove the big king and the small king from a deck of playing cards, and the remaining 52 cards are placed neatly on the table in order of size and suit, with the front facing up. Then turn all the spades and hearts over, that is, face down; then turn all the J, Q, K over, that is, the face up becomes down, and the face down becomes face up. At this time, you don't need to count, you know how many cards are facing up.
把一副扑克牌中的大王小王抽走，剩下52张牌，按大小顺序和花色在桌上放整齐，正面全部向上．然后把所有的黑桃、红桃都翻过去，即正面向下；接着把所有的J、Q、K翻过来，即正面向上的变成向下的，正面向下的变成正面向上的．这时，你不用数，知道正面向上的牌共有多少张．
<gadget id="calculator">52 / 2</gadget>
<output>26</output>

<result>26</result>