If three cubes with surface areas of 24, 54, and 294 square centimeters are melted into a large cube (excluding losses), what is the volume of the large cube in cubic centimeters?
将表面积为24、54、294平方厘米的三个正方体熔成一个大正方体(不计损耗)，则这个大正方体的体积为多少立方厘米．
<gadget id="calculator">2 * 2 * 2</gadget>
<output>8</output>

<gadget id="calculator">3 * 3 * 3</gadget>
<output>27</output>

<gadget id="calculator">7 * 7 * 7</gadget>
<output>343</output>

<gadget id="calculator">8 + 27 + 343</gadget>
<output>378</output>

<result>378</result>