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

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            int L = int.Parse(args[0]);
            int N = int.Parse(args[1]);
            int count = 0;
            int[] W = new int[args.Length - 2];
            for (int i = 0; i < N; i++)
            {
                W[i] = int.Parse(args[2 + i]);
            }
            Array.Sort(W);
            while (L > 0)
            {
                L = L - W[count];
                if (count < W.Length)
                {
                    if (L > 0)
                    {
                        count++;
                    }
                }
            }
            Console.WriteLine(count);
        }
    }
}