Put a flower garden with potted flowers on the square, 6 pots or 9 pots in each row, can be placed in a whole row, how many potted flowers are there at least?
广场上用盆花摆一个花圃，每行6盆或9盆，都可以摆成整行，最少有多少盆花？
<gadget id="calculator">2 * 3 * 3</gadget>
<output>18</output>

<result>18</result>