using System;
using System.Collections.Generic;
using System.Linq;

namespace No5
{
	class MainClass
	{
		public static void Main (string[] args)
		{
			var size = Convert.ToInt32(Console.ReadLine ());
			Console.ReadLine ();
			var values = Console.ReadLine ()
				.Split(' ')
				.Select (v => Convert.ToInt32 (v)).ToList ();
			values.Sort ();
			for (int i = 0; i < values.Count; i++) {
				if (values [i] <= size) {
					size -= values [i];
				} else {
					Console.WriteLine (i);
					return;
				}
			}
			Console.WriteLine (values.Count.ToString ());
		}
	}
}