There are four natural numbers A, B, C, and D, the least common multiple of A and B is 36, and the least common multiple of C and D is 90. What is the least common multiple of the four numbers A, B, C, and D?
有A、B、C、D四个自然数，A和B的最小公倍数是36，C和D的最小公倍数是90．A、B、C、D四个数的最小公倍数是多少．
<gadget id="calculator">2 * 2 * 3 * 3 * 5</gadget>
<output>180</output>

<result>180</result>