A clothing company wants to make a batch of women's trench coats. It has been making 145 pieces every day for 4 days, and there is still a shortfall of 420 pieces. How many pieces of this batch of trench coats were originally planned to be made?
一个服装公司要做一批女士风衣，已经做了4天，每天做145件，还差420件，这批风衣原计划做多少件？
<gadget id="calculator">145 * 4</gadget>
<output>580</output>

<gadget id="calculator">580 + 420</gadget>
<output>1_000</output>

<result>1_000</result>