import java.util.*;
public class Count{
	public static void main(String[] arg){
		Scanner sc = new Scanner(System.in);
		int l = sc.nextInt();
		int n = sc.nextInt();
		int[] a = new int[n];
		int c = 0;
		int i;
		for(i = 0;i<n;i++){
			a[i]=sc.nextInt();
		}
		Arrays.sort(a);
		i = 0;
		while((l>=0)&&(i<n)){
			l = l - a[i];
			i++;
			c++;
		}
		if((i!=n)||(l<0))c--;
		System.out.println(c);
	}
}