Buy 4 ice cream cones, get 1 free. There are 80 students in the third grade, and each of them wants to eat 1 ice cream cone. How should I buy it?
冰激凌蛋筒买4送1，三年级有80名同学，每人想吃1个冰激凌蛋筒，应该怎样买？
<gadget id="calculator">4 + 1</gadget>
<output>5</output>

<gadget id="calculator">80 / 5</gadget>
<output>16</output>

<gadget id="calculator">80 - 16</gadget>
<output>64</output>

<result>64</result>