#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;
}