#include <bits/stdc++.h>

using namespace std;

int main()
{
    int n;
    cin >> n;
    vector<int> calories(n);
    for(int calories_i = 0; calories_i < n; calories_i++)
    {
       cin >> calories[calories_i];
    }
    
    
    int b=1,m=0,s=0;
    long int miles=0;
    int calories_i=0;
    b = calories[calories_i];
    for(calories_i=0; calories_i < n; calories_i++)
    {       
        if(calories[calories_i]>b)
        {
            m=b;
            b=calories[calories_i];
        }
        if(calories[calories_i]<b)
        {
            if(calories[calories_i]>m)
            {
                s=m;
                m=calories[calories_i];
            }
            if(calories[calories_i]<m)
            {
                s=calories[calories_i];  
            }
        }
        
    }
    miles= b*1;
    miles= miles+m*2;
    miles= miles+s*4;
    cout  <<  miles;
    return 0;
}