Five students have storybooks a, b, c, d, and e respectively. It is known that a is 3 times as much as b, 4 times as much as c, 6 times as much as d, and 9 times as much as e. What is the minimum number of storybooks they have in common? Book.
五位同学分别有故事书a、b、c、d、e本，已知a是b的3倍，c的4倍，d的6倍，e的9倍，则他们共有故事书最少为多少本．
<gadget id="calculator">36 / 3</gadget>
<output>12</output>

<gadget id="calculator">36 / 4</gadget>
<output>9</output>

<gadget id="calculator">36 / 6</gadget>
<output>6</output>

<gadget id="calculator">36 / 9</gadget>
<output>4</output>

<gadget id="calculator">36 + 12 + 9 + 6 + 4</gadget>
<output>67</output>

<result>67</result>