Among the four numbers 0, 3, 4, and 7, choose three numbers, what is the difference between the largest number and the smallest number?
在0，3，4，7这四个数中，任选三个数，组成的最大数和最小数的差是多少
<gadget id="calculator">743 - 304</gadget>
<output>439</output>

<result>439</result>