Among the 12 people, 8 people love to sing, 6 people love to play table tennis, and 3 people love to both sing and play table tennis. How many people don't like singing and don't like playing table tennis?
在12人中，爱唱歌的有8人，爱打乒乓球的有6人，既爱唱歌又爱打乒乓球的有3人，那么不爱唱歌且不爱打乒乓球的有多少．
<gadget id="calculator">6 - 3</gadget>
<output>3</output>

<gadget id="calculator">8 + 3</gadget>
<output>11</output>

<gadget id="calculator">12 - 11</gadget>
<output>1</output>

<result>1</result>