#include <bits/stdc++.h>
#define int long long
#define iostream() ios::sync_with_stdio(false),cin.tie(NULL),cout.tie(NULL);
using namespace std;
const int maxn = 1e6+7;
const int MAXN = maxn / 2;
int n,a[maxn],b[maxn],sum;
double ave;
signed main()
{
    iostream();
    cin >> n;
    for (int i = 0; i < n; i++)
    {
    	cin >> a[i];
    	b[i] = a[i];
    	sum += a[i];
	}
	sort(a,a + n);
	sum -= a[n - 1];
	for (int i = 0; i < n; i++)
	{
		for (int j = 0; j < n; j++)
		{
			if (a[i] == b[j])
			{
				b[j] = i + 1;
				break;
			}
		}
	}
	/*cout << setiosfixed(ios::fixed);
	cout << setprecision(2) << sum / n;*/
	ave = sum / n;
	printf("%.2lf",ave);
 	return 0;
}