A, B, C, and D donate to the Hope Project. A’s donation accounts for (1/2) of the total donations of the other three people, B’s donation accounts for the other three people’s (1/3), and C’s donation accounts for the remaining three people’s (1/3). 4), Ding's donation is 650 yuan, how much did they donate in total?
甲乙丙丁四人向希望工程捐款，甲的捐款占其余三人捐款总数的(1/2)，乙的捐款占其他三人的(1/3)，丙的捐款占其余三人的(1/4)，丁的捐款数是650元，他们共捐款多少元？
<gadget id="calculator">2 + 1</gadget>
<output>3</output>

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

<gadget id="calculator">1 + 3</gadget>
<output>4</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">4 + 1</gadget>
<output>5</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/3) - (1/4) - (1/5)</gadget>
<output>13/60 = around 0.216667</output>

<gadget id="calculator">650 / (13/60)</gadget>
<output>3_000</output>

<result>3_000</result>