using System;

namespace No37_2{
    public class Program{
        public static void Main(string[] args){
            var sr = new StreamReader();
            //---------------------------------
            var T = sr.Next<int>();
            var N = sr.Next<int>();
            var A = sr.Next<int>(2, N).Permute();

            var dp = new int[T + 1];
            foreach(var a in A){
                do{
                    for(var i = T; i >= a[0]; i--) {
                        dp[i] = Math.Max(dp[i], dp[i - a[0]] + a[1]);
                    }
                } while((a[1] /= 2) != 0);
            }

            Console.WriteLine(dp[T]);
            //---------------------------------
        }
    }

    public static class ExMethod{
        public static T[][] Permute<T>(this T[][] src){
            var x = src.Length;
            var y = src[0].Length;

            var ret = new T[y][];
            for(var i = 0; i < y; i++){
                ret[i] = new T[x];
                for(var j = 0; j < x; j++){
                    ret[i][j] = src[j][i];
                }
            }

            return ret;
        } 
    }

    public class StreamReader{
        private readonly char[] _c = {' '};
        private int _index = -1;
        private string[] _input = new string[0];

        public T Next<T>(){
            if(_index == _input.Length - 1){
                _index = -1;
                while(true){
                    string rl = Console.ReadLine();
                    if(rl == null){
                        if(typeof(T).IsClass) return default(T);
                        return (T)typeof(T).GetField("MinValue").GetValue(null);
                    }
                    if(rl != ""){
                        _input = rl.Split(_c, StringSplitOptions.RemoveEmptyEntries);
                        break;
                    }
                }
            }
            return (T)Convert.ChangeType(_input[++_index], typeof(T), System.Globalization.CultureInfo.InvariantCulture);
        }

        public T[] Next<T>(int x){
            var ret = new T[x];
            for(var i = 0; i < x; ++i) ret[i] = Next<T>();
            return ret;
        }

        public T[][] Next<T>(int y, int x){
            var ret = new T[y][];
            for(var i = 0; i < y; ++i) ret[i] = Next<T>(x);
            return ret;
        }
    }
}