Chashan Toy Factory plans to produce a batch of toys, the first time it completed the plan (1/2), the second time it completed the plan (1/3), and the third time it completed 300, the result exceeded the plan (1/6), How many toys do you plan to produce?
茶山玩具厂计划生产一批玩具，第一次完成计划的(1/2)，第二次完成计划的(1/3)，第三次完成300个，结果超过计划的(1/6)，计划生产玩具多少个？
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

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

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(1/6) - (1/2) - (1/3)</gadget>
<output>-2/3 = around -0.666667</output>

<gadget id="calculator">1 + (-2/3)</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">300 / (1/3)</gadget>
<output>900</output>

<result>900</result>