A section of square steel is 4 decimeters long, and its cross section is a square with side length 5 cm. What is the volume of this section of square steel?
一段方钢长4分米，横截面是一个边长5厘米的正方形，这段方钢的体积是多少？
<gadget id="calculator">4 * 10</gadget>
<output>40</output>

<gadget id="calculator">5 * 5 * 40</gadget>
<output>1_000</output>

<result>1_000</result>