Take 5 numbers from 1, 1, 3, 3, 5, 5, 7, 7, 9, 9, at least 4 of which are not repeated and the unit digit of their product is 1, then these 5 numbers What is the sum of .
从1、1、3、3、5、5、7、7、9、9中取出5个数，其中至少有4个数不重复并且它们的乘积的个位数字是1，那么这5个数的和是多少．
<gadget id="calculator">1 + 3 + 7 + 9 + 9</gadget>
<output>29</output>

<result>29</result>