A log with a length of 2 meters is cut into five pieces, and the surface area increases by 5 square centimeters. What is the original volume of the log in cubic centimeters?
一根长2米的圆木，截成五段后，表面积增加5平方厘米，这根圆木原来的体积是多少立方厘米．
<gadget id="calculator">4 * 2</gadget>
<output>8</output>

<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">2 * 100</gadget>
<output>200</output>

<gadget id="calculator">(5/8) * 200</gadget>
<output>125</output>

<result>125</result>