Among the 100 students, there are 78 students who get excellent in Chinese, 85 who get excellent in mathematics, and 90 who get excellent in English. Find the minimum number of students who get excellent in all three subjects.
在100名学生中，有78人语文得优，85人数学得优，90人英语得优，求最小多少人三门学科都得优．
<gadget id="calculator">100 - 78</gadget>
<output>22</output>

<gadget id="calculator">100 - 85</gadget>
<output>15</output>

<gadget id="calculator">100 - 90</gadget>
<output>10</output>

<gadget id="calculator">100 - 22 - 15 - 10</gadget>
<output>53</output>

<result>53</result>