#include <stdio.h>

int main() {
    int a, b, c, d, e, f, g;
    while (scanf("%d %d %d %d %d %d %d", &a, &b, &c, &d, &e, &f, &g) != EOF) {
        int max = (a > b) ? a : b;
        max = (max > c) ? max : c;
        max = (max > d) ? max : d;
        max = (max > e) ? max : e;
        max = (max > f) ? max : f;
        max = (max > g) ? max : g;

        int min = (a < b) ? a : b;
        min = (min < c) ? min : c;
        min = (min < d) ? min : d;
        min = (min < e) ? min : e;
        min = (min < f) ? min : f;
        min = (min < g) ? min : g;

        float average =(a+b+c+d+e+f+g-max-min)/5.0;
        printf("%.2f\n",average);
    }
    
    return 0;
}