The students practiced measurement by inserting poles on the side of a 100-meter-long road. First, one was inserted at the starting point, and then one was inserted every 5 meters. How many poles were inserted in total?
同学们练习测量，在一条长100米的路边插标杆，先在起点插一根，以后每隔5米插一根，一共插了多少根标杆？
<gadget id="calculator">100 / 5</gadget>
<output>20</output>

<gadget id="calculator">20 + 1</gadget>
<output>21</output>

<result>21</result>