using System;
using System.Collections.Generic;
using System.Linq;
using System.IO;
using static System.Console;

class Program
{
    static void Main()
    {
        var L = int.Parse(ReadLine());
        ReadLine();
        var dp = ReadLine().Split().Select(int.Parse).ToList();
        dp.Sort();
        var c = 0;
        for (int i = 0; i <= L; c++)
        {
            i += dp[c];
        }
        WriteLine(c);
    }
}