Each class selects 4 male and 4 female students to participate in the competition. There are 7 classes in the lower grades. How many students in the lower grades participated in the rope skipping competition?
每班选出男、女同学各4名参加比赛，低年级共有7个班．低年级一共有多少名同学参加跳绳比赛？
<gadget id="calculator">4 + 4</gadget>
<output>8</output>

<gadget id="calculator">8 * 7</gadget>
<output>56</output>

<result>56</result>