There are some apples, 5 numbers of 5, 4 more; 6 numbers of 6, 5 more. What is the minimum number of these apples?
有一些苹果，5个5个的数，多4个；6个6个的数，多5个．这些苹果最少有多少个？
<gadget id="calculator">5 * 6</gadget>
<output>30</output>

<gadget id="calculator">30 - 1</gadget>
<output>29</output>

<result>29</result>