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

namespace yukicoder_5 {
    class Program {
        static void Main(string[] args) {
            int p = int.Parse(Console.ReadLine());
            int q = int.Parse(Console.ReadLine());
            string[] r = Console.ReadLine().Split(' ');
            int[] a = new int[q];
            for(int i = 0; i < q; i++) {
                a[i] = int.Parse(r[i]);
            }
            Array.Sort(a);
            int sum = 0;
            int count = 0;
            for(int i = 0; sum < p; i++) {
                sum += a[i];
                count++;
            }
            if (sum > p) {
                count--;
            }
            Console.WriteLine(count);
            Console.ReadLine();
        }
    }
}