A piece of wood with uniform thickness is 28 decimeters long, and it needs to be sawed into 4 decimeters long sticks. It takes 3 minutes to saw each time, and 2 minutes to rest after sawing a section. How many minutes will it take to saw all the pieces?
一根粗细均匀的木头长28分米，要全部锯成4分米长的木棍，每锯一次要3分钟，锯完一段休息2分钟，全部锯完要用多少分钟？
<gadget id="calculator">28 / 4</gadget>
<output>7</output>

<gadget id="calculator">7 - 1</gadget>
<output>6</output>

<gadget id="calculator">6 * 3</gadget>
<output>18</output>

<gadget id="calculator">7 - 1 - 1</gadget>
<output>5</output>

<gadget id="calculator">2 * 5</gadget>
<output>10</output>

<gadget id="calculator">18 + 10</gadget>
<output>28</output>

<result>28</result>