The fifth-grade dance team rehearses the dance. When they stand in formation, they line up with 6 people, and with 7 people. If they have 8 people, they need to arrange 4 people to lead the singing to complete the line. May I ask this At least how many people are there in the dance team?
五年级舞蹈队排练舞蹈，站队形时，他们6个人一排刚好排完，7个人一排也刚好排完，8个人一排，就要安排4个人出列领唱才能刚好排完，请问这个舞蹈队至少有几个人？
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