#include <bits/stdc++.h>
using namespace std;

int main()
{
    int t;
    cin >> t;
    std::vector<int> a(t);
    for(int i = 0; i < t; ++i)
    {
        cin >> a[i];
    }
    sort(a.begin(), a.end());
    int ans = a[i];
    for(int i = 1; i < t; ++i)
    {
        ans += (a[i] + ans)/2;
    }
    cout << ans;
    return 0;
}