There is a piece of paper on the table, the first time it is cut into 3 pieces and put back on the table; the second time it is picked up from the table, cut into 3 pieces and put back on the table;  … After performing 8 such operations, how many pieces of paper are there in total on the table?
桌上有1张纸，第一次把它剪成3块放回桌上；第二次从桌上拿起1块剪成3块后放回桌上；…．进行了这样的8次操作后，桌上一共有多少块纸．
<gadget id="calculator">8 - 1</gadget>
<output>7</output>

<gadget id="calculator">2 * 7</gadget>
<output>14</output>

<gadget id="calculator">3 + 14</gadget>
<output>17</output>

<result>17</result>