#include<bits/stdc++.h>
using namespace std;
#define N 1005
int main()
{
    double a, ans;
    int n;
    while(cin >> n)
    {
        double mx = 0, sum = 0;
        for(int i = 1; i <= n; ++i)
        {
            cin >> a;
            mx = max(mx, a);
            sum += a;
        }
        if(sum - mx < mx)
            ans = sum - mx;
        else
            ans = sum / 2;
        cout << fixed << setprecision(1) << ans << endl;
    }       
    return 0;
}