import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Scanner;

public class No16 {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		long x = sc.nextLong();
		int N = sc.nextInt();
		List<Long> a = new ArrayList<Long>();
		for(int i = 0;i < N;i++) {
			a.add(sc.nextLong());
		}
		Collections.sort(a);
		long xn = 1;
		long sum = 0;
		for(long i = 0;i <= a.get(a.size()-1);i++) {
			if(i != 0) {
				xn = xn * x % 1000003;
			}
			if(a.indexOf(i) != -1) {
				sum = (sum + xn) % 1000003;
			}
		}
		System.out.println(sum);
	}
}