using System;

public class Program {
	public static void Main(string[] args) {
		int l = int.Parse(Console.ReadLine());
		Console.ReadLine();
		string[] s = Console.ReadLine().Split(' ');
		int[] w = new int[s.Length];
		for (int i = 0; i < w.Length; i++) {
			w[i] = int.Parse(s[i]);
		}
		Array.Sort(w);
		int count = 0;
		for (int i = 0; i < w.Length; i++) {
			if (l - w[i] >= 0) {
				l -= w[i];
				count++;
			}
		}
		Console.WriteLine(count);
	}
}