import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int[] array = new int[7];
int max = Integer.MIN_VALUE;
int min = Integer.MAX_VALUE;
int countMax = 0;
int countMin = 0;
// 找最大值和最小值
for(int i = 0 ; i < array.length ; i++) {
array[i] = sc.nextInt();
if(max < array[i]) {
max = array[i];
}
if(min > array[i]) {
min = array[i];
}
}
// 计算最大值和最小值出现的次数
for(int i = 0 ; i < array.length ; i++) {
if(max == array[i]) {
countMax++;
array[i] = 0;
}
if(min == array[i]) {
countMin++;
array[i] = 0;
}
}
// 计算平均分
int sum = 0;
double avg = 0.0;
for(int i = 0 ; i < array.length ; i++) {
sum += array[i];
}
avg = sum*1.0 / (array.length - countMax - countMin);
System.out.println(String.format("%.2f", avg));
}
}