#include <stdio.h>
int main(){
    double sum=0.0,avg=0.0;
    double score;
    double min_score=0.0,max_score=0.0;
    int n;
    if (scanf("%d",&n)!=EOF && n>2){
        for (int i=0;i<n;i++){
            if (scanf("%lf",&score)!=EOF){
                sum+=score;
                if (i==0){max_score=score;min_score=score;}
                if (i>0){
                    if (score>max_score){max_score=score;}
                    if (score<min_score){min_score=score;}
                }

            }
        }
        avg = (sum-max_score-min_score)/(n-2);
        printf("%.2f",avg);
    }
    else{
        printf("input wrong");
    }
    return 0;
}