using System;
public class Program
{
    static void Main()
    {
        string l = Console.ReadLine();
        string n = Console.ReadLine();
        string w = Console.ReadLine();
        string[] t = w.Split(' ');
        int[] ary = new int[t.Length];
        int total = int.Parse(l);
        int num = int.Parse(n);
        int cnt = 0;
        for(int i=0;i<ary.Length;i++)
        {
            ary[i] = int.Parse(t[i]);
        }
        for (int i = 0; i < t.Length; i++)
        {
            
            for (int j = i + 1; j < t.Length; j++)
            {
                
                if (ary[j] < ary[i])
                {
                    int temp = ary[i];
                    ary[i] = ary[j];
                    ary[j] = temp;
                }
                
            }
            
        }
        for (int i = 0; i < num; i++)
        {
            total = total - ary[i];
            if (total < 0)
            {
                break;
            }
            cnt++;
        }
        Console.WriteLine(cnt);
    }
}