import java.util.Arrays;
import java.util.Scanner;

public class Yukicoder05 {

	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 i, sum = 0;
		for (i = 0; i < N; i++) {
			sum += W[i];
			if (sum >= L) break;
		}
		System.out.println(i);
	}
}