using System;
namespace csharptest
{
    class Program
    {
        static void Main(string[] args)
        {
            int l = int.Parse(Console.ReadLine());
            int n = int.Parse(Console.ReadLine());
            int[] w = new int[n];
            string[] str = Console.ReadLine().Split(' ');
            for (int m = 0; m < str.Length; m++)
            {
                w[m] = int.Parse(str[m]);
            }
            Array.Sort(w);
            int count = -1, box = 0;
            while (l > box)
            {
                count++;
                box += w[count];
            }
            Console.WriteLine(count);
        }
    }
}