There are 4 red socks and 4 blue socks in the bag. It is obvious how many socks can be taken out to make a pair of blue socks.
袋子里有红色和蓝色的袜子各4只，明明至少拿出多少只袜子才能配成一双蓝袜子．
<gadget id="calculator">5 + 1</gadget>
<output>6</output>

<result>6</result>