import java.util.*;
public class No5 {
    public static void main(String[] arg){
		Scanner sc = new Scanner(System.in);
		int l = sc.nextInt();
		int n = sc.nextInt();
		int[] w = new int[n];
		int i;
		int count = 0;

		for (i = 0; i < n; i++){
			w[i] += sc.nextInt();
		}

		Arrays.sort(w);
		for (i = 0; i < n; i++){
			l -= w[i];
			if (l <= 0){
				break;
			}
			count++;
		}
		System.out.println(count);
	}
}