//10米跳水计分系统
#include <stdio.h>
int main(){
    int score[10];
    int min,max;
    float sum;
    scanf("%d",&score[0]);
    min = max = score[0];

    for (int i = 1;i < 10;i ++){
        scanf("%d",&score[i]);
        sum += score[i];
        if (min > score[i])
            min = score[i];
        else if (max < score[i])
            max = score[i];

    }
    sum -= ( max - min );
    printf("%f",sum/8);

}