There are 164 students in the third grade. There are 28 people participating in the art interest group. The number of people participating in the music interest group is twice that of the art group. The number of people participating in the sports interest group is twice that of the music group. Groups can only participate in two interest group activities at most, so how many people should participate in the two at least.
三年级有164名学生，参加美术兴趣小组的共有28人，参加音乐兴趣小组的人数是美术小组人数的2倍，参加体育兴趣小组的是音乐小组的2倍，如果每人至少参加一项兴趣小组，最多只能参加两项兴趣小组活动，那么参加两项至少有多少人．
<gadget id="calculator">28 * 2</gadget>
<output>56</output>

<gadget id="calculator">56 * 2</gadget>
<output>112</output>

<gadget id="calculator">28 + 56 + 112</gadget>
<output>196</output>

<gadget id="calculator">196 - 164</gadget>
<output>32</output>

<result>32</result>