#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define llong long long

const int DIVISOR = 1000003;

long multi(long base, int exp) {
    if(exp == 0) return 1;
    if(exp == 1) return base;
    return (multi(base, exp/2) * multi(base, exp/2) * multi(base, exp%2)) % DIVISOR;
}

int main() {
    int x, n;
    cin >> x >> n;
    llong result = 0;
    rep(i, n) {
        int a;
        cin >> a;
        result += multi((long)x, a);
    }
    cout << result % DIVISOR << endl;
}