#include <stdio.h>

int main(){
	// 入力された値・最小値・最大値・合計値
	int val,min,max,sum;
	double ans;
	
	for(int i = 0;i < 6;i ++){
		scanf("%d",val);
		sum += val;
		if(i = 0){
			min = val;
			max = val;
		}else if(min > val){
			min = val;
		}else if(max < val){
			max = val;
		}
	}
	ans = (sum - (max + min) / 4);
	printf("%.2f",ans);
}