There is a cube with an edge length of 3.5, and a cube with an edge length of 1.2 is dug out on one of the faces, and a cube with an edge length of 0.7 is dug out from the bottom surface of the cube with an edge length of 1.2, and then a cube with an edge length of 0.7 is dug out. A cube with an edge length of 0.3 is cut out from the bottom of the cube. What is the surface area of this figure?
有一个棱长为3.5的正方体，在其中一个面上挖去一个棱长为1.2的正方体，在棱长为1.2的正方体的底面上挖去一个棱长为0.7的正方体，再在棱长为0.7的正方体的底面上挖去一个棱长为0.3的正方体．问此图形的表面积？
<gadget id="calculator">3.5 * 3.5 * 6</gadget>
<output>73.5</output>

<gadget id="calculator">1.2 * 1.2 * 4</gadget>
<output>5.76</output>

<gadget id="calculator">0.7 * 0.7 * 4</gadget>
<output>1.96</output>

<gadget id="calculator">0.3 * 0.3 * 4</gadget>
<output>0.36</output>

<gadget id="calculator">5.76 + 1.96 + 0.36</gadget>
<output>8.08</output>

<gadget id="calculator">73.5 + 8.08</gadget>
<output>81.58</output>

<result>81.58</result>