using System;
using System.Linq;

class Program {
    static void Main() {
        int L = int.Parse(Console.ReadLine());
        Console.ReadLine();
        var seq = Console.ReadLine().Split().Select(int.Parse).OrderBy(x => x);
        int sum = 0;
        int cnt = 0;
        foreach (var elem in seq) {
            sum += elem;
            if (sum > L) break;
            cnt++;
        }
        Console.WriteLine(cnt);
    }
}