A piece of iron wire can be made into a cuboid with a length of 10 cm, a width of 7 cm, and a height of 4 cm. If you use it to make a cube frame, and then weld iron sheets on all sides of it, what is the volume of this iron box in cubic centimeters?
一根铁丝，可以做成一个长10厘米，宽7厘米，高4厘米的长方体．如果用它做一个正方体框架，再给它的各个面焊上铁皮，那么这个铁盒的容积是多少立方厘米？
<gadget id="calculator">10 + 7 + 4</gadget>
<output>21</output>

<gadget id="calculator">4 / 12</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">21 * (1/3) * 21 * (1/3) * 21 * (1/3)</gadget>
<output>343</output>

<result>343</result>