using System;
using System.Collections.Generic;
using System.Linq;
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 q = new Queue<int>(dp);
        var c = 0;
        while (q.Count != 0)
        {
            L -= q.Dequeue();
            if (L < 0) break;
            c++;            
        }
        WriteLine(c);
    }
}