#include <stdio.h>

#define Z 1000003
int x, N;
long long int a;

int getxn( int *xn, int n );

int main()
{
	int xn[100];
	long long int sum = 0;
	scanf("%d %d\n", &x, &N );

	xn[0] = 1;

	for( int i = 0; i < N - 1 ; i++ ) {
		scanf("%d ", &a );
		sum += getxn( xn, a );
		sum = sum % Z;
	}
	scanf("%d\n", &a );
	sum += getxn( xn, a );
	sum = sum % Z;

	printf("%d\n", sum);
	return 0;
}

int getxn( int *xn, int n )
{
	static int r = 0;

	if( n <= r ) {
		return xn[n];
	}
		
	for( int i = r+1; i <= n; i++ ) {
		xn[i] = ( xn[i-1] * x ) % Z;
	}
	r = n;
	return xn[n];
}