There is a mathematical operation symbol "☆" to make the following formulas true: 4☆5=17, 8☆5=23, 7☆9=30. Then, what is the value of the formula 10☆9☆13?
有一个数学运算符号"☆"使以下算式成立：4☆5=17，8☆5=23，7☆9=30．那么，算式10☆9☆13的值是多少．
<gadget id="calculator">10 + 9</gadget>
<output>19</output>

<gadget id="calculator">19 * 2</gadget>
<output>38</output>

<gadget id="calculator">10 - 9</gadget>
<output>1</output>

<gadget id="calculator">38 - 1</gadget>
<output>37</output>

<gadget id="calculator">37 + 13</gadget>
<output>50</output>

<gadget id="calculator">50 * 2</gadget>
<output>100</output>

<gadget id="calculator">37 - 13</gadget>
<output>24</output>

<gadget id="calculator">100 - 24</gadget>
<output>76</output>

<result>76</result>