#include <iostream>
using namespace std;
#include <cstdio>
#include <string.h>
#include <stdlib.h>
#include <math.h>

#define FOR(i,a,b) for(int (i)=(a);i<(b);i++)

typedef long long ll;
typedef unsigned long long ull;
typedef long double lb;

/* ここからが本編 */
int main(void)
{
   ll i,j,k,l;
   int x,n;
   ll a;
   ll ans = 0;
   cin >> x >> n;
   FOR(i,0,n) {
      cin >> a;
      ll tmp = 1;
      FOR(j,0,a) tmp = (tmp*x)%1000003; /* */
      ans = (ans+tmp) % 1000003;/* */
   }
   cout << ans << endl;
   return 0;
}