import java.util.ArrayList;
import java.util.Collections;
import java.util.Scanner;
class Main{
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int haba = sc.nextInt(),num = sc.nextInt();
		ArrayList <Integer> list = new ArrayList<Integer>();
		
		for(int i = 0 ; i < num ; i++)list.add(sc.nextInt());
		Collections.sort(list);
		int count = 0 , kosu = 0;
		
		while(count < haba) {
			count += list.get(kosu);
			kosu++;
		}
		
		System.out.println(kosu - 1);
		
	}
}