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

public class Ruijokasan {

	public static void main(String[] args) {
		Scanner s = new Scanner(System.in);
		int x = s.nextInt(), N = s.nextInt();
		int[] a = new int[N];
		for(int i = 0;i < N;i++){
			a[i] = s.nextInt();
		}
		s.close();
		int t = (int)(Math.pow(10,6) + 3);
		Arrays.sort(a);
		for(int i = 1;i < N;i++){
			for(int j = 0;j < i;j++){
				a[i] -= a[j];
			}
		}
		int sum = 1;
		for(int i = N-1;i >= 0;i--){
			for(int j = 0;j < a[i];j++){
				sum *= x;
				if(sum > t){
					sum %= t;
				}
			}
			if(i == 0){
				break;
			}
			sum++;
		}
		System.out.println(sum);

	}

}