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

class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        // Read input
        int k = scanner.nextInt();
        int n = scanner.nextInt();
        int[] a = new int[n];
        for (int i = 0; i < n; i++) {
            a[i] = scanner.nextInt();
        }

        // Sort the array
        Arrays.sort(a);

        // Iterate through the sorted array
        for (int i = 0; i < n; i++) {
            k -= a[i];
            if (k < 0) {
                System.out.println(i);
                return;
            }
        }

        // If all elements are used
        System.out.println(n);
    }
}