import java.util.*;
public class Main {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int[] score=new int[7];
while(sc.hasNext())
{
for(int i=0;i<7;i++)
{
score[i]=sc.nextInt();
}
Arrays.sort(score);
double average=(score[1]+score[2]+score[3]+score[4]+score[5])/5.0;
System.out.printf("%.2f\n",average);
}
}
}

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