Students from 6 grades of Youyi Primary School participated in the long-distance running competition. Each grade was divided into 4 groups with 25 students in each group. How many people are there in total?
友谊小学6个年级的学生参加长跑比赛，每个年级分成4组，每组有25人．一共有多少人参加比赛？
<gadget id="calculator">25 * 4 * 6</gadget>
<output>600</output>

<result>600</result>