import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Scanner;
public class Main{
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int c = sc.nextInt();
		int h = sc.nextInt();
		List<Integer> a = new ArrayList<>();
		for(int i=0;i<h;i++) {
			int x = sc.nextInt();
			a.add(x);
		}
		Collections.sort(a);
		int sum =0;
		int cnt=0;
		int g=0;
		while(sum<c) {
			sum+=a.get(g);
			if(sum<=c) {
				cnt++;
			}
			g++;
		}
		System.out.println(cnt);
	}
}