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

public class Yuki5
{
	public static void Main()
	{
		var l = int.Parse(Console.ReadLine());
		Console.ReadLine();
		var w = Console.ReadLine()
				.Split(' ')
				.Select(x => int.Parse(x))
				.ToList();
		
		w.Sort();
		
		int count = 0;
		int sum = 0;
		
		for(int i = 0;i < w.Count; i++)
		{
			sum += w[i];
			if(sum > l) break;
			count++;
		}
		
		Console.WriteLine(count);
	}
}