A section of cuboid steel, 1.6 meters long, cross-section is a square with side length 4 cm. It just weighs 7.8 grams per cubic centimeter. How much does this square steel weigh?
一段长方体钢材，长1.6米，横截面是边长4厘米的正方形．每立方厘米刚重7.8克，这块方钢重多少？
<gadget id="calculator">1.6 * 100</gadget>
<output>160</output>

<gadget id="calculator">4 * 4 * 160 * 7.8</gadget>
<output>19_968</output>

<result>19_968</result>