using System;
using System.Collections.Generic;
using System.Text;
using System.Linq;

class Program
{
    public void Proc()
    {
        Reader.IsDebug = false;
        int maxTaizai = int.Parse(Reader.ReadLine());
        int inputCount = int.Parse(Reader.ReadLine());
        
        this.MachijikanList = Reader.ReadLine().Split(' ').Select(a=>int.Parse(a)).ToArray();
        
        int[] manzoku = Reader.ReadLine().Split(' ').Select(a=>int.Parse(a)).ToArray();

        int ans = this.GetAns(manzoku, maxTaizai);
        Console.WriteLine(ans);
    }
    
    private Dictionary<string, Dictionary<int, int>> dic = new Dictionary<string, Dictionary<int, int>>();
    
    private int GetAns(int[] manzoku, int remain) {
        string key = string.Join("#", manzoku);
        if(!dic.ContainsKey(key)) {
            dic.Add(key, new Dictionary<int, int>());
        }
        if(dic[key].ContainsKey(remain)) {
            return dic[key][remain];
        }
        
        if(remain == 0) {
            return 0;
        }
        
        int ans = 0;
        for(int i=0; i<this.MachijikanList.Length; i++) {
            if(this.MachijikanList[i] <= remain) {
                int[] sub = (int[])manzoku.Clone();
                sub[i] = sub[i] / 2;
                int ret = this.GetAns(sub, remain - this.MachijikanList[i]) + manzoku[i];
                ans = Math.Max(ret, ans);
            }
        }
        dic[key].Add(remain, ans);
        return ans;
    }
    
    
    private int[] MachijikanList ;
    

    

    public class Reader
    {
        public static bool IsDebug = true;
        private static String PlainInput = @"


9
2
8 2
9 5





";
        private static System.IO.StringReader Sr = null;
        public static string ReadLine()
        {
            if (IsDebug)
            {
                if (Sr == null)
                {
                    Sr = new System.IO.StringReader(PlainInput.Trim());
                }
                return Sr.ReadLine();
            }
            else
            {
                return Console.ReadLine();
            }
        }
    }
    static void Main()
    {
        Program prg = new Program();
        prg.Proc();
    }
}