A 52 cm long lead wire can be used to weld a cuboid teaching aid that is 5 cm long, 4 cm wide, and how many centimeters high.
用一根52厘米长的铅丝，正好可以焊成长5厘米，宽4厘米，高多少厘米的长方体教具．
<gadget id="calculator">5 * 4</gadget>
<output>20</output>

<gadget id="calculator">4 * 4</gadget>
<output>16</output>

<gadget id="calculator">52 - 20 - 16</gadget>
<output>16</output>

<gadget id="calculator">16 / 4</gadget>
<output>4</output>

<result>4</result>