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

class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        long k = scanner.nextLong();
        int n = scanner.nextInt();
        long[] a = new long[n];
        
        for (int i = 0; i < n; i++) {
            a[i] = scanner.nextLong();
        }
        
        Arrays.sort(a);
        
        for (int i = 0; i < n; i++) {
            k -= a[i];
            if (k < 0) {
                System.out.println(i);
                return;
            }
        }
        
        System.out.println(n);
    }
}