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

class Question005
{
	public static void main(String[] str)
	{
	
		Scanner scan = new Scanner(System.in);
		
		int width = scan.nextInt();
		int num = scan.nextInt();
		int block[] = new int[num];
		
		for(int i=0; i<num; i++){
			block[i] = scan.nextInt();

		}
		
		Arrays.sort(block);
		
		int cnt=0;
		
		for(int i=0; i<num; i++){
			width = width - block[i];
			if(width <= 0){
				continue;
			}
			cnt++;

		}
		
		System.out.println(cnt);
	}
}