Master Li made 50 cylindrical iron drums with a diameter of 8dm and a height of 12dm. The iron drums weigh 6.5kg per square decimeter. How many kilograms of iron sheets should be used to make these iron drums?
李师傅做了50个直径是8dm高是12dm的圆柱形铁桶，每平方分米的铁桶重6.5kg，做好这些铁桶应该用多少千克的铁皮？
<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<gadget id="calculator">4 ** 2</gadget>
<output>16</output>

<gadget id="calculator">3.14 * 16</gadget>
<output>50.24</output>

<gadget id="calculator">3.14 * 8 * 12</gadget>
<output>301.44</output>

<gadget id="calculator">50.24 + 301.44</gadget>
<output>351.68</output>

<gadget id="calculator">351.68 * 50 * 6.5</gadget>
<output>114_296</output>

<result>114_296</result>