using System;

public class No5 {
	public static void Main(string[] args) {
	    int box     = int.Parse(Console.ReadLine());
	    int block   = int.Parse(Console.ReadLine());
	    var array   = Console.ReadLine().Split(" ");
	    int inBlock = 0;
	    int count   = 0;
	    
	    Array.Sort(array);
	    
	    for( var i = 0; i < block; i++ ){
	        int temp = int.Parse(array[i]); 
	        inBlock = ( box < inBlock + temp ) ? inBlock : inBlock+=temp; count++;
	    }
	    
	    Console.WriteLine(count);
	    
	}
}