import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Scanner;

public class No5 {
	public static void main(String args[]){
		String str = "";
		int boxSize = 0;
		int blockQuantity = 0;
		ArrayList<Integer> blockSize = new ArrayList<Integer>();

		Scanner sc = new Scanner(System.in);

		BufferedReader input =
				new BufferedReader (new InputStreamReader (System.in));

			//str = input.readLine();
			boxSize = sc.nextInt();

			//str = input.readLine();
			blockQuantity = sc.nextInt();

			for(int i = 0; i < blockQuantity; i++){
				blockSize.add(sc.nextInt());
			};

			Collections.sort(blockSize);

			int cnt = 0;
			while(true){

				boxSize = boxSize - blockSize.get(cnt);

				if(boxSize < 0 || boxSize == 0){
					if(boxSize==0)
						cnt++;
					break;

				}
				cnt++;
				if(blockQuantity==cnt){break;}

			}

			System.out.println(cnt);

	}
}