There are 35 sixth-grade students participating in the literature and art group, and 18 people participating in the mathematics interest group are three times the number of participating in the literature and art group. How many people participate in the mathematics interest group?
六年级同学参加文艺小组的有35人，参加数学兴趣小组的人数是参加文艺小组人数的3倍还多18人，参加数学兴趣小组有多少人？
<gadget id="calculator">35 * 3</gadget>
<output>105</output>

<gadget id="calculator">105 + 18</gadget>
<output>123</output>

<result>123</result>