There are three kinds of books A, B, and C, 58 people have read at least one kind, 32 people have read A book, 24 people have read B book, 27 people have read C book, and A has been read. There are 10 people who have read books B and B, 9 people who have read books B and C, 14 people who have read books A and C, and how many people have read all three books?
有A、B、C三种书，至少读过一种的有58人，读过A书的有32人，读过B书的有24人，读过C书的有27人，读过A、B两书的有10人，读过B、C两书的有9人，读过A、C两书的有14人，三种书均读过的有多少人？
<gadget id="calculator">58 + 10 + 14 + 9</gadget>
<output>91</output>

<gadget id="calculator">32 + 27 + 24</gadget>
<output>83</output>

<gadget id="calculator">91 - 83</gadget>
<output>8</output>

<result>8</result>