There are 3 questions in a knowledge contest, and the full score for each question is 6 points. When giving points, only natural numbers 0 to 6 points can be given. If the product of the scores of the three questions of the contestants is 36 points, and the scores of each participant are not exactly the same. How many people can participate at most?
一次知识竞赛共3道题，每题满分为6分．给分时只能给自然数0～6分．若参赛人三题的得分之积都是36分，且每人得分不完全相同．最多有多少人参赛？
<gadget id="calculator">3 + 6 + 3</gadget>
<output>12</output>

<result>12</result>