A workshop of an electric fan factory needs to manufacture a batch of parts, 261 of which are manufactured on the first day, and the rest (3/7) are completed on the second day. In this way, half of this batch of parts is completed in two days. How many parts are there in this batch?
电扇厂一个车间要制造一批零件，第一天制造261个，第二天完成余下的(3/7)，这样两天就完成这批零件的一半，这批零件有多少个？
<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">(3/7) * 261</gadget>
<output>783/7 = around 111.857143</output>

<gadget id="calculator">261 - (783/7)</gadget>
<output>1_044/7 = around 149.142857</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/2) - (3/7)</gadget>
<output>1/14 = around 0.071429</output>

<gadget id="calculator">(1_044/7) / (1/14)</gadget>
<output>2_088</output>

<result>2_088</result>