import java.util.*;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int l = sc.nextInt();
		int n = sc.nextInt();
		int w[] = new int[n];
		for(int i=0;i<n;i++){
			w[i]=sc.nextInt();
		}
		Arrays.sort(w);
		int now_wide = 0;
		int i = 0;
		while(n>i){
			now_wide += w[i];
			if(now_wide >= l){
				break;
			}
			i++;
		}
		System.out.println(i);
	}
}