import java.util.Arrays;
import java.util.Scanner;
public class No5 {
	public static void main(String[]args) {
		Scanner sc = new Scanner(System.in);

		int length = 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 cnt=0;
		for(int j=0;j<n;j++) {
			length = length-w[j];

			if(length<0)	break;

			cnt++ ;

		}

		System.out.println(cnt);

	}

}