using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace yukicore
{
    class Program
    {

        static void Main(string[] args)
        {
            int boxSize = int.Parse(Console.ReadLine());
            Console.ReadLine();
            int[] blockSizes =
                Console.ReadLine()
                    .Split(' ')
                    .Select(x => int.Parse(x))
                    .ToArray();
            Array.Sort(blockSizes);
            int sum = 0;
            int cnt = 0;
            foreach (var blockSize in blockSizes)
            {
                sum += blockSize;
                if(sum>=boxSize)
                    break;
                    cnt++;
            }
            Console.WriteLine(cnt);
        }
    }
}