A road is 5,000 meters long, and (1/5) of the full length was repaired in the first week. The rest (1/2) was repaired in the second week, how many meters are left unrepaired?
一条路全长5000米，第一周修了全长的(1/5)．第二周修了余下的(1/2)，还剩下多少米没有修？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">5_000 * (4/5)</gadget>
<output>4_000</output>

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

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

<gadget id="calculator">4_000 * (1/2)</gadget>
<output>2_000</output>

<result>2_000</result>