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#include <cstdio>
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#include <algorithm>
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#include <numeric>
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using namespace std;
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int a[100];
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int main()
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{
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int n;
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while(~scanf("%d",&n))
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{
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for(int i=0;i<n;i++)
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scanf("%d",a+i);
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printf("%.2lf\n",(accumulate(a,a+n,0)-*max_element(a,a+n)-*min_element(a,a+n))/(n-2.00));
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}
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return 0;
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}
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