/* package whatever; // don't place package name! */

import java.util.*;
import java.lang.*;
import java.io.*;

/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		// your code goes here
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        int max = Integer.parseInt(br.readLine());
        int N   = Integer.parseInt(br.readLine());
        String[] lines = br.readLine().split(" ");
        ArrayList<Integer> list = new ArrayList<Integer>();
        for(String st:lines){
            list.add(Integer.parseInt(st));
        }
        Collections.sort(list);
        int ans = 0;
        for(int i:list){
            max -= i;
            if(max>=0){
                ans++;
            }else{
                break;
            }
        }
        System.out.println(ans);
    }
}