A group of primary school students, 16 people participated in the football group, 11 people participated in the music group, 13 people participated in the math group, 6 people participated in the dance group, and the students who participated in the football group only participated in the music group or math group, and participated in the math group The students only participate in the football team or the dance team, and each student participates in at least one team, then how many students are there at least in this group.
一群小学生，有16个人参加了足球小组，11个人参加了音乐小组，13个人参加了数学小组，6个人参加了舞蹈小组，参加足球小组的学生只再参加了音乐小组或者数学小组，参加数学小组的学生只再参加了足球小组或者舞蹈小组，且每个学生都至少参加1个小组，那么这群学生最少有多少名．
<gadget id="calculator">16 + 6</gadget>
<output>22</output>

<result>22</result>