using System;
using System.Linq;

public class Program
{
	static void Main()
	{
		var Width = Console.ReadLine().Split(' ').Select(x => Convert.ToInt32(x)).First();
		Console.ReadLine();

		var BlockWidth = Console.ReadLine().Split(' ').Select(x => Convert.ToInt32(x)).OrderBy(x => x).ToList<int>();

		for (int i = 0; i < BlockWidth.Count; i++)
		{
			Width -= BlockWidth[i];

			if(Width == 0)
			{
				Console.WriteLine(i + 1);
				break;
			}

			if(Width < 0)
			{
				Console.WriteLine(i);
				break;
			}
		}

		if (Width > 0)
			Console.WriteLine(BlockWidth.Count);
	}
}