To build a canal, the full length (2/5) was built for the first time, and the full length (1/3) was repaired for the second time. There are still 800 meters left to be repaired. How many meters is the total length of this canal?
修一条水渠，第一次修了全长的(2/5)，第二次修了全长的(1/3)，还剩800米没修，求这条水渠全长多少米？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

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

<gadget id="calculator">1 - (2/5) - (1/3)</gadget>
<output>4/15 = around 0.266667</output>

<gadget id="calculator">800 / (4/15)</gadget>
<output>3_000</output>

<result>3_000</result>