The parts factory processes a batch of parts, the planned (4/7) is processed on the first day, the planned (3/8) is processed on the second day, and 80 more are processed on the third day. The result exceeds the plan (1/14), how many parts are there in this batch?
配件工厂加工一批零件，第一天加工了计划的(4/7)，第二天又加工了计划的(3/8)，第三天又加工了80个．结果超过计划的(1/14)，这批零件共有多少个？
<gadget id="calculator">1 / 14</gadget>
<output>1/14 = around 0.071429</output>

<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">(1/14) - (4/7) - (3/8)</gadget>
<output>-7/8 = around -0.875</output>

<gadget id="calculator">1 + (-7/8)</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">80 / (1/8)</gadget>
<output>640</output>

<result>640</result>