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

public class NumberBlocks {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int L = 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);
		
		for(int i = 0;L > 0; i ++){
			L -= W[i];
			
			if(L < 0){
				if(i < 0){
				i --;
				}
				
				System.out.println(i);
				break;
			}
		}

	}

}