Cut a red cuboid with 5 long cuts, 2 wide cuts, and several high cuts to get 28 small cuboids with one side red. How many small cuboids are there with red sides?
将一个外表涂红色的长方体，长切5刀，宽切2刀，高切若干刀，得到一面是红色的小长方体有28个，求两面是红色的小长方体有多少个？
<gadget id="calculator">6 - 2</gadget>
<output>4</output>

<gadget id="calculator">3 - 2</gadget>
<output>1</output>

<gadget id="calculator">4 - 2</gadget>
<output>2</output>

<gadget id="calculator">4 + 1 + 2</gadget>
<output>7</output>

<gadget id="calculator">7 * 4</gadget>
<output>28</output>

<result>28</result>