using System;

class Program
{
    static void Main()
    {
        new Program().Solve();
    }
    
    private int N;
    private int[]D;
    private int[]MaxHP;
    private int[]HP;
    
    private void Scan()
    {
        N=int.Parse(Console.ReadLine());
        var l=Console.ReadLine().Split(' ');
        D=new int[N];
        for(int i=0;i<N;i++)
        {
            D[i]=int.Parse(l[i]);
        }
    }
    
    private void Calc(int n)
    {
        int p=n;
        int a=1;
        int pos=0;
        while(p>0)
        {
            if(p%2==1)
            {
                if(D[pos]>0)
                {
                    if(HP[n-a]>0)
                    {
                        MaxHP[n]=Math.Max(MaxHP[n-a],MaxHP[n]);
                        HP[n]=Math.Max(Math.Min(MaxHP[n-a],HP[n-a]+D[pos]),HP[n]);
                    }
                }
                else
                {
                    if(HP[n-a]+D[pos]>0)
                    {
                        MaxHP[n]=Math.Max(MaxHP[n-a]+100,MaxHP[n]);
                            
                        HP[n]=Math.Max(HP[n-a]+D[pos],HP[n]);
                    }
                }
            }
            a*=2;
            p/=2;
            pos++;
        }
    }
    
    public void Solve()
    {
        Scan();
        int loop=1<<N;
        MaxHP=new int[loop];
        HP=new int[loop];
        MaxHP[0]=100;
        HP[0]=100;
        for(int i=1;i<loop;i++)
        {
            Calc(i);
        }
        //for(int i =0;i<loop;i++)
        //{
        //    Console.WriteLine($"{i} {HP[i]} {MaxHP[i]}");
        //}
        Console.WriteLine(HP[loop-1]);
    }
}