There is a gymnasium. The floor needs to be paved with tiles, and they are arranged in a hollow square. There are 26 tiles on each side of the outer layer and 20 tiles on each side of the inner layer. How many tiles are used in total?
有一体育馆，地面想要铺瓷砖，排成空心方阵，外层每边26块，内层每边20块，一共使用了多少块．
<gadget id="calculator">26 * 4</gadget>
<output>104</output>

<gadget id="calculator">104 - 4</gadget>
<output>100</output>

<gadget id="calculator">20 * 4</gadget>
<output>80</output>

<gadget id="calculator">80 - 4</gadget>
<output>76</output>

<gadget id="calculator">76 + 8</gadget>
<output>84</output>

<gadget id="calculator">84 + 8</gadget>
<output>92</output>

<gadget id="calculator">100 + 92 + 84 + 76</gadget>
<output>352</output>

<result>352</result>