A section of cuboid steel with a length of 4 decimeters has a cross-section of a square with a side length of 4 cm. If the steel weighs 7.8 grams per cubic centimeter, how many grams does the steel weigh?
一段长4分米的长方体钢材，它的横截面是边长4厘米的正方形，如果每立方厘米的钢重7.8克，钢材的重量是多少克？
<gadget id="calculator">4 * 10</gadget>
<output>40</output>

<gadget id="calculator">4 * 4 * 40 * 7.8</gadget>
<output>4_992</output>

<result>4_992</result>