#include <stdio.h>
int main(){
int n,i;
double m[101],average,min,max;
while(scanf("%d",&n)!=EOF){
average=0;
min=10000;max=0;
for(i=0;i<n;i++){
scanf("%lf",&m[i]);
average+=m[i];
if(m[i]>max){
max=m[i];
}
if(m[i]<min){
min=m[i];
}
}
average-=min;
average-=max;
average/=(n-2);
printf("%.2lf\n",average);
}
return 0;
}