using System;
using System.Linq;

namespace TestConsole
{
    class Program
    {
        static void Main(string[] args)
        {
            var width = int.Parse(Console.ReadLine());
            Console.ReadLine();
            var blocks = Console.ReadLine().Split().Select(i => int.Parse(i)).OrderBy(i=>i);

            int count = 0;
            foreach (var item in blocks)
            {
                width -= item;
                if (width < 0)
                {
                    break;
                }
                count++;
            }
            Console.WriteLine(count);
        }
    }
}