import java.util.ArrayList;
import java.util.Collections;
import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int box = sc.nextInt();
		int count = sc.nextInt();
		ArrayList<Integer> boxlist = new ArrayList<Integer>();
		for(int i=0;i<count;i++){
			int input = sc.nextInt();
			boxlist.add(input);
		}
		sc.close();
		Collections.sort(boxlist);
		int total=0;
		int result = 0;
		for(int k=0;box>total&&boxlist.size()>k;k++){
			total += boxlist.get(k);
			if(box>total){
				result++;
			}else{
				break;
			}
		}
		System.out.println(result);
	}// mainmethod

} // class