using System;
using System.Linq;

public class Hello{
    public static void Main(){
        int length = int.Parse(Console.ReadLine().Trim());
        int n = int.Parse(Console.ReadLine().Trim());
        int[] blocks = Console.ReadLine().Trim().Split(' ').Select(x => int.Parse(x)).ToArray();
        int answer = 0;
        
        Array.Sort(blocks);
        
        for(int i = 0; i < blocks.Length; i++)
        {
            length = length - blocks[i];
            if(length < 0)
            {
                break;
            }
            answer ++;
        }

        Console.WriteLine(answer);
    }
}