using System;
using System.Linq;

class Program {
    static void Main() {
        int total = 0;
        int count = 0;
        int L = int.Parse(Console.ReadLine().Trim());
        Console.ReadLine();
        int[] W = Console.ReadLine().Trim().Split(' ').Select(x => int.Parse(x)).ToArray();
        Array.Sort(W);
        foreach (int i in W) {
            total += i;
            if(total > L){
                break;
            }
            count ++;
        }
        Console.WriteLine(count);
    }
}