#include <bits/stdc++.h>
using namespace std;

constexpr int MOD = 1000003;

long mpow(long a, long b) {
  long res = 1;
  while (b > 0) {
    if (b & 1) res = res * a % MOD;
    a = a * a % MOD;
    b >>= 1;
  }
  return res;
}

int main() {
  int X, N, A, ans = 0;
  cin >> X >> N;
  while (cin >> A) (ans += mpow(X, A)) %= MOD;
  cout << ans << "\n";
}