#include<bits/stdc++.h>
using namespace std;
const int N=1e5+5;
int n,a[N];
int main()
{
    while(cin>>n)
    {
        int sum{0},maxx{0};
        for(int i=1;i<=n;i++)
        {
            cin>>a[i];
            sum+=a[i];
            if(a[i]>maxx)
                maxx=a[i];
        }
        if(maxx>sum-maxx)
            cout<<fixed<<setprecision(1)<<(double)(sum-maxx)<<endl;
        else 
            cout<<fixed<<setprecision(1)<<sum/2.0<<endl;
    }
    return 0;
}

#include<bits/stdc++.h>
using namespace std;
int n,a[137891],t;
int main()
{
    while (cin>>n)
    {
        for (int i=1;i<=n;i++)
        {
            cin>>a[i];
        }
        int xb;
        double sum=0,hmax=0;
        for (int i=1;i<=n;i++)
        {
            if (a[i]>hmax)
                hmax=a[i],xb=i;
        }
        for (int i=1;i<=n;i++)
        {
            if (i==xb)
                continue;
            sum+=a[i];
        }
        if (sum>=hmax)
        {
            cout<<fixed<<setprecision(1)<<(sum+hmax)/2*1.0<<endl;
        }
        else
        {
            cout<<fixed<<setprecision(1)<<sum*1.0<<endl;
        }
    }
    return 0;
}