If a cylinder with a height of 10 decimeters is cut into two equal sections, the surface area of the cylinder increases by 157 decimeters squared. Find the original surface area of the cylinder?
把一个高是10分米的圆柱截成相等的两段，圆柱的表面积增加了157平方分米，求原来这个圆柱的表面积？
<gadget id="calculator">3.14 * 5 * 2 * 10</gadget>
<output>314</output>

<gadget id="calculator">314 + 157</gadget>
<output>471</output>

<result>471</result>