import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.Arrays;

public class No005 {
    public static void main(String[] args) {
        try {
            BufferedReader br = new BufferedReader(new InputStreamReader(
                    System.in));
            int L = Integer.parseInt(br.readLine());
            int N = Integer.parseInt(br.readLine());
            String[] WStrArray = br.readLine().split(" ");

            int[] W = new int[N];
            for (int i = 0; i < N; i++) {
                W[i] = Integer.parseInt(WStrArray[i]);
            }
            Arrays.sort(W);

            int count = 0;
            for (int i = 0; i < N; i++) {
                L = L - W[i];
                if (L <= 0) {
                    break;
                }
                count++;
            }

            System.out.println(count);
        } catch (Exception e) {
            System.err.println("Error:" + e.getMessage());
        }
    }

}