Ou put some coins into 15 boxes, and the number of coins in each box is neither a multiple of 4 nor a multiple of 5; and the number of coins is not equal, and not less than 23. So, how many coins does Ou have at least?
欧欧将一些硬币放入15个盒子中，每个盒子中放入的硬币个数既不是4的倍数也不是5的倍数；并且硬币个数都不相等，且都不小于23．那么，欧欧至少有硬币多少个．
<gadget id="calculator">23 + 26 + 27 + 29 + 31 + 33 + 34 + 37 + 38 + 39 + 41 + 42 + 43 + 46 + 47</gadget>
<output>536</output>

<result>536</result>