Class 5 (1) has 28 students in total, 12 students participated in the painting interest group, 10 students participated in the calligraphy interest group, 5 students participated in both painting and calligraphy, how many students did not participate in painting and calligraphy?
五(一)班共有28名同学，有12名同学参加了绘画兴趣小组，有10名参加了书法兴趣小组，绘画和书法都参加的有5人，没参加绘画和书法的有多少人？
<gadget id="calculator">28 - 12 - 10</gadget>
<output>6</output>

<gadget id="calculator">6 + 5</gadget>
<output>11</output>

<result>11</result>