import java.util.Scanner;
import java.util.Set;
import java.util.TreeSet;

public class Test {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);

		Set<Integer> set = new TreeSet<Integer>();
		int len = sc.nextInt(), n = sc.nextInt();
		for(int i = 0; i < n; i++){
			set.add(sc.nextInt());
		}
		int cnt = 0, sum = 0;
		for(int i : set){
			sum += i;
			if(sum <= len){
				cnt++;
			} else {
				break;
			}
		}
		System.out.println(cnt);
	}
}