#include <bits/stdc++.h>
using namespace std;
using lint = int64_t;
int main() {
    int x, n;
    cin >> x >> n;
    vector<lint> a(n);
    for (lint i = 0; i != a.size(); i++) {
        cin >> a[i];
    }

    lint ans = 0;
    lint mod = 1000003;
    for (lint i = 0; i != a.size(); i++) {
        lint tmp = 1;
        for (lint j = 0; j != a[i]; j++) {
            tmp = (tmp * x) % mod;
        }
        ans = (ans + tmp) % mod;
    }
    cout << ans << endl;

    // system("pause");
}