A cuboid with a length of 50 cm, a width of 30 cm, and a height of 10 cm is cut out of the bottom of a cuboid with a length of 50 cm, a width of 30 cm, and a height of 10 cm. What is the surface area of the block?
在一个长50厘米，宽30厘米，高10厘米的长方体石块底面中间凿出一个长10厘米，宽5厘米，高10厘米的长方体，这个石块的表面积是多少？
<gadget id="calculator">50 * 30</gadget>
<output>1_500</output>

<gadget id="calculator">50 * 10</gadget>
<output>500</output>

<gadget id="calculator">30 * 10</gadget>
<output>300</output>

<gadget id="calculator">1_500 + 500 + 300</gadget>
<output>2_300</output>

<gadget id="calculator">2_300 * 2</gadget>
<output>4_600</output>

<gadget id="calculator">10 * 5 * 2</gadget>
<output>100</output>

<gadget id="calculator">4_600 - 100</gadget>
<output>4_500</output>

<gadget id="calculator">5 * 10 * 2</gadget>
<output>100</output>

<gadget id="calculator">10 * 10 * 2</gadget>
<output>200</output>

<gadget id="calculator">4_500 + 100 + 200</gadget>
<output>4_800</output>

<result>4_800</result>