There are four unequal natural numbers. The difference between the largest number and the smallest number is equal to 4. The product of the largest number and the smallest number is an odd number. The sum of the four numbers is the smallest prime number among two-digit numbers. The product of these four numbers is How many.
有四个互不相等的自然数最大数与最小数的差等于4，最大数和最小数的积是一个奇数，四个数的和是两位数中最小的质数，这四个数的乘积是多少．
<gadget id="calculator">1 * 2 * 3 * 5</gadget>
<output>30</output>

<result>30</result>