#include<stdio.h>
int main(void)
{
    int a[100],n,i;
    while(scanf("%d",&n)!=EOF)
    {
        n>2&&n<=100;
        for(i=0;i<n;i++)
        scanf("%d",&a[i]);
        int max,min;
        max=a[0];
        min=a[0];
        for(i=0;i<n;i++)
        {
            if(max<a[i])
            max=a[i];
            if(min>a[i])
            min=a[i];
        }
        int s=0;
        for(i=0;i<n;i++)
        {
            s+=a[i];
        }
        printf("%.2f",(s-max-min)*1.0/(n-2));
        printf("\n");
    }
    return 0;
} 

 

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