A series of numbers: 1, 1, 2, 2, 3, 3, 4, 4, .... What is the sum of the first 36 numbers starting from the first number on the left?
一串数：1，1，2，2，3，3，4，4，…．从左边第一个数起，前36个数的和是多少．
<gadget id="calculator">35 + 1</gadget>
<output>36</output>

<gadget id="calculator">36 / 2</gadget>
<output>18</output>

<gadget id="calculator">1 + 18</gadget>
<output>19</output>

<gadget id="calculator">19 * 9 * 2</gadget>
<output>342</output>

<result>342</result>