There are 20 seats in the first row of the movie theater, 54 seats in the last row, and 1 more seat in the second row than the first row. How many seats are there in this movie theater?
电影院的第一排有20个座位，最后一排有54个座位，后一排比前一排多1个座位，这个电影院一共有多少个座位．
<gadget id="calculator">20 + 54</gadget>
<output>74</output>

<gadget id="calculator">54 - 20</gadget>
<output>34</output>

<gadget id="calculator">34 + 1</gadget>
<output>35</output>

<gadget id="calculator">35 / 2</gadget>
<output>35/2 = around 17.5</output>

<gadget id="calculator">74 * (35/2)</gadget>
<output>1_295</output>

<result>1_295</result>