C :

#include<stdio.h>

int main(){ 
	int n,k,t,sum=0,max,min;
	while(scanf("%d",&n)!=EOF){
		k=n;
		sum=0;
		while(n--){
			scanf("%d",&t);
			if(n==k-1){
				min=t;
				max=t;
			}
			if(t<min) min=t;
			if(t>max) max=t;
			sum=sum+t;
		}
		printf("%.2lf\n",(double)(sum-min-max)/(k-2));
	}

	return 0; 
}