import java.util.Scanner;
import java.util.ArrayList;
import java.util.List;
import java.util.Collections;
class Wandbox
{
    public static void main(String[] args)
    {
    	Scanner sc = new Scanner(System.in);
    	
    	List<Integer> list = new ArrayList<>();
    	
    	int l = sc.nextInt();
    	int n = sc.nextInt();
    	int cnt = 0;
    	
    	for (int i = 0; i < n; i++) {
    		list.add(sc.nextInt());
    	}
    	
    	Collections.sort(list);
    	
    	for (int i = 0; l >= 0; i++) {
    		l -= list.get(i);
    		if (l >= 0) {
    			
    			cnt++;
    		} 
    	}
    	
    	System.out.println(cnt);
    }
}