#include <bits/stdc++.h>

using namespace std;
const int N = 1010;
int a[N];

int main() {
    int n;
    cin >> n;
    for (int i = 1; i <= n; i++) cin >> a[i];
    sort(a + 1, a + n + 1);
    int sum = 0;
    for (int i = 2; i < n; i++)sum += a[i];
    double avg = 1.0 * sum / (n - 2);
    printf("%.2lf", avg);
    return 0;
}