import java.util.Scanner;
import java.util.Arrays;
public class Main {
	public static void main(String[] args){
		Scanner scanner = new Scanner(System.in);
		int sum = 0;
		int count = 0;
		int L = scanner.nextInt();
		int N = scanner.nextInt();
		int a[] = new int[N];
		for(int i = 0;i < N;i++){
			a[i] = scanner.nextInt();
		}
		Arrays.sort(a);
		while(sum<L){
			sum += a[count];
			count++;
		}
		if(sum>L){
			count -= 1;
		}
		System.out.println(count);
		
		scanner.close();
	}
}