Arbor Day is here, and the tree planting task accepted by the young pioneers in the fourth grade is to plant trees on both sides of the 168-meter-long school road, one tree every 6 meters (trees are planted at both ends of the school road). The chief counselor, Mr. Li, did the math and just planted one tree for every three team members. How many young pioneers are there in the fourth grade?
植树节到了，四年级的少先队员接受的植树任务是在168米长的校道两旁种树，每隔6米种一棵(校道两端都种树)．总辅导员李老师算了算，刚好每3名队员种一棵．四年级有少先队员多少人．
<gadget id="calculator">168 / 6</gadget>
<output>28</output>

<gadget id="calculator">28 + 1</gadget>
<output>29</output>

<gadget id="calculator">29 * 2</gadget>
<output>58</output>

<gadget id="calculator">58 * 3</gadget>
<output>174</output>

<result>174</result>