A 2-meter-long timber is sawn into 3 sections along the cross-section, and the surface area increases by 316 square decimeters. What is the original volume of this log in cubic decimeters?
把一个2米长的木料沿横截面锯成3段，表面积增加316平方分米．这根木料原来的体积是多少立方分米．
<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">316 / 4</gadget>
<output>79</output>

<gadget id="calculator">79 * 2 * 10</gadget>
<output>1_580</output>

<result>1_580</result>