There are 50 people in class 31, 25 of them like apples, 22 like oranges, and 13 like both apples and oranges. How many people do not like to eat two kinds of fruits?
三1班有50人，其中25人喜欢吃苹果，22人喜欢吃橘子，13人既喜欢吃苹果又喜欢吃橘子．两种水果都不喜欢吃的人有多少人？
<gadget id="calculator">22 - 13</gadget>
<output>9</output>

<gadget id="calculator">25 + 9</gadget>
<output>34</output>

<gadget id="calculator">50 - 34</gadget>
<output>16</output>

<result>16</result>