#include <iostream>
using namespace std;
typedef long long ll;

const ll MOD = 1000003;
ll mod_pow(ll x, ll e){
    ll v = 1;
    for(;e;e>>=1){
        if(e&1)v = (v * x) % MOD;
        x = (x * x) % MOD;
    }
    return v;
}


int main(){
    int x, N;
    cin >> x >> N;

    ll res = 0;
    for(int i=0;i<N;i++){
        ll e;
        cin >> e;
        
        res = (res + mod_pow(x, e)) % MOD;
    }
    
    cout << res << endl;
    return 0;
}