using System;
using System.Linq;

class Yuki5 {
	static void Main(string[] _) {
		var count  = 0;
		var length = int.Parse(Console.ReadLine());
		Console.ReadLine();
		var width = Console.ReadLine().Split().Select(int.Parse).ToList();
		width.Sort();
		foreach (var l in width) {
			if (length >= l) {
				length -= l;
				count++;
			} else break;
		}
		Console.WriteLine(count);
	}
}