A number is not only a multiple of 3 and 5, but also a multiple of 7 and 10, so what is the smallest number that should be
一个数既是3和5的倍数，又是7和10的倍数，那么这个数最小应该是多少
<gadget id="calculator">3 * 7 * 10</gadget>
<output>210</output>

<result>210</result>