using System;

namespace yukicoder
{
    class Program
    {

        static void Main(string[] args)
        {

            int L = int.Parse(Console.ReadLine());
            int N = int.Parse(Console.ReadLine());
            var W = Console.ReadLine();
            int[] num = new int[W.Length];

            var s = W.Split(" ");

            for (int x = 0;  x < s.Length; x++)
            {
                num[x] = int.Parse(s[x]);
            }
            
            Array.Sort(num);

            
            
            int count = 0;
            for (int n = 0; n < num.Length; n++)
            {
                if (num[n] > L || count >= N)
                {
                    break;
                }
                else if (num[n] == 0)
                {
                    continue;
                }
                else { 
                L -= num[n];
                count++;
                }
            }
            Console.WriteLine(count);
        }
    }
}