using System;

namespace No005_数字のブロック
{
    class Program
    {
        static private int l;
        static private int n;
        static private int max = 0;

        static public void Main(string[] args)
        {

            l = int.Parse(Console.ReadLine());
            n = int.Parse(Console.ReadLine());
            string[] input = Console.ReadLine().Split(' ');
            int[] w = new int[n];
            int ww = 0;

            for (int i = 0; i < n; i++)
                w[i] = int.Parse(input[i]);

            Sort(ref w);

            foreach(int a in w)
            {
                ww += a;
                if (ww < l)
                    max++;
                else
                    break;
            }

            Console.WriteLine(max);
        }

        static private void Sort(ref int[] data)
        {
            for (int i = 0; i < data.Length - 1; i++)
                for (int j = i; j < data.Length; j++)
                    if (data[i] > data[j])
                        Swap(ref data[i], ref data[j]);
        }

        static private void Swap(ref int a, ref int b)
        {
            int temp = a;
            a = b;
            b = temp;
        }
    }
}