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

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

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

		try {
			str = input.readLine();
			boxSize = Integer.parseInt(str);

			str = input.readLine();
			blockQuantity = Integer.parseInt(str);

			for(int i = 0; i < blockQuantity; i++){
				str = input.readLine();
				blockSize.add(Integer.parseInt(str));
			};

			Collections.sort(blockSize);

			int cnt;
			for(cnt = 0 ;0 <= boxSize;cnt++){
				boxSize = boxSize - blockSize.get(cnt);
			}
			System.out.println(cnt - 1);

		} catch (IOException e) {
			e.printStackTrace();
		}
	}
}