#include <stdio.h>

int main() {
    int a;
    int max=0;
    int min=100;
    float sum=0.0;
    int count=0;
    while(scanf("%d",&a)!=EOF){
        max=max>a?max:a;
        min=min<a?min:a;
        sum+=a;
        count++;
        if(count==7){
    printf("%.2f\n",(float)(sum-max-min)/5);
    max=0;
    min=100;
    sum=0.0;
    count=0;
        }
    }
    
}