Evenly distribute a batch of books to 6 children, and the result is 1 extra book; distribute evenly to 8 children, also get 1 extra book; distribute evenly to 9 children, still get 1 extra book. How many books are there at least?
把一批书平均分给6个小朋友，结果多出1本；平均分给8个小朋友，也多出1本；平均分给9个小朋友，还是多出1本．这批书至少有多少本．
<gadget id="calculator">2 * 2 * 2 * 3 * 3</gadget>
<output>72</output>

<gadget id="calculator">72 + 1</gadget>
<output>73</output>

<result>73</result>