import java.util.Scanner;
import java.util.Arrays;
public class Main{
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int m = sc.nextInt();
		int[] arr = Arrays.stream(sc.nextLine().split(" "))
				.mapToInt(Integer::parseInt)
			.toArray();
		Arrays.sort(arr);
		int i = 0;
		int j = 0;
		for(i = 0;  m > 0; i++) {
			j += arr[i];
			if(j > n) {
				break;
			}
			m--;
			}
		System.out.println(i);
	}
}