There is a path in the park, and a fence needs to be built along the side of the road on both sides. A total of 82 wooden stakes are nailed from the beginning to the end. If the distance between each wooden pole is 3m, how long is the path? If it is changed to one wooden pile every 4m, how many do not need to be moved?
公园里有一条小路，两侧要沿路边做一道栅栏，从头到尾共钉了82根木桩，如果每根木杆之间的距离为3m，这条小路有多长？如果要改成每4m一根木桩，有多少根不需要移动？
<gadget id="calculator">82 / 2</gadget>
<output>41</output>

<gadget id="calculator">41 - 1</gadget>
<output>40</output>

<gadget id="calculator">40 * 3</gadget>
<output>120</output>

<gadget id="calculator">120 / 12</gadget>
<output>10</output>

<gadget id="calculator">10 + 1</gadget>
<output>11</output>

<gadget id="calculator">11 * 2</gadget>
<output>22</output>

<result>22</result>