A road is 80 meters long, and a small flag (to be inserted at both ends) is inserted every 5 meters. How many red flags are inserted on both sides?
一条路长80米，每隔5米插一面小旗(两端要插)，两边共插多少面红旗．
<gadget id="calculator">80 / 5</gadget>
<output>16</output>

<gadget id="calculator">16 + 1</gadget>
<output>17</output>

<gadget id="calculator">17 * 2</gadget>
<output>34</output>

<result>34</result>