The fifth grade dance team rehearsed for the Children's Day Gala. When standing in formation, they just finished lining up in a row of 5 people; also just finished lining up in a row of 6 people; and arranged 2 people in a row to lead the singing. How many people does this dance team have at least?
五年级舞蹈队为儿童节晚会排练舞蹈．站队形时，他们5个人一排刚好排完；6个人一排也刚好排完；7个人一排，就可以安排2个人出列领唱．请问这个舞蹈队至少有几个人？
<result>30</result>