If a number is divided by 9, the remainder is 8, and when divided by 6, the remainder is 5. If this number is divisible by 5 by adding 1, what is the smallest natural number that meets the conditions?
一个数除以9余8，除以6余5，这个数加上1就能被5整除，则符合条件的最小自然数是多少．
<gadget id="calculator">3 * 3 * 2 * 5</gadget>
<output>90</output>

<gadget id="calculator">90 - 1</gadget>
<output>89</output>

<result>89</result>