A, B, C, and D plant a total of 1,800 trees. The number of trees planted by A is equal to that of the other three (2/7), the number of trees planted by B is equal to that of the other three (1/5), and the number of trees planted by C is The number belongs to the other three (5/13). How many trees does Ding Zhi have?
甲、乙、丙、丁四人共植树1800棵，甲植树的棵数是其余三人的(2/7)，乙植树的棵数是其余三人的(1/5)，丙植树的棵数是其余三人的(5/13)，丁植树多少棵？
<gadget id="calculator">7 + 2</gadget>
<output>9</output>

<gadget id="calculator">2 / 9</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">1 + 5</gadget>
<output>6</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">13 + 5</gadget>
<output>18</output>

<gadget id="calculator">5 / 18</gadget>
<output>5/18 = around 0.277778</output>

<gadget id="calculator">1 - (2/9) - (1/6) - (5/18)</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1_800 * (1/3)</gadget>
<output>600</output>

<result>600</result>