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

namespace PracticeAtCoder
{
    class Program
    {
        static void Main(string[] args)
        {
			
			
			//ブロック
			string sA = Console.ReadLine();
			string sB = Console.ReadLine();
			string sC = Console.ReadLine();
			string[] sD = sC.Split(' ');
			
			int[] after = sD.Select(s => int.Parse(s)).ToArray();
			
			Array.Sort(after);
			int intSA = int.Parse(sA); 
			int intSB = int.Parse(sB); 
			int i = 0;
			int sumA = 0;
			
			//While文に書き直して判断を行う
			while(i < intSB && sumA +  after[i] <= intSA){
				sumA = sumA +  after[i];
				i++;
				
			}	
			Console.WriteLine(i);
			
		}
    }
}