Five students are playing basketball. After the first 4 students finished throwing, each of them scored 8 balls on average. When the fifth student finished throwing, the average number of balls thrown by the five students was exactly 1 more than the average of the first 4 students. How many goals did the fifth student score?
五名同学玩投篮球比赛．前4人投完后，平均每人投进了8个球，当第五名同学投完后，五人的平均投入球数比前4个人的平均数正好多了1个．第五名同学投进了几个球？
<gadget id="calculator">8 + 1</gadget>
<output>9</output>

<gadget id="calculator">9 * 5</gadget>
<output>45</output>

<gadget id="calculator">8 * 4</gadget>
<output>32</output>

<gadget id="calculator">45 - 32</gadget>
<output>13</output>

<result>13</result>