#include<iostream>
#include<algorithm>
using namespace std;

typedef long long ll;

static const int MOD=1000003;

ll mod_pow(ll x, ll n){ //べき乗
    ll ans=1;
    while(n!=0){
        if(n&1) ans=ans*x%MOD;
        x=x*x%MOD;
        n=n>>1;
    }
    return ans;
}

int main(){
    int x,N; cin >> x >> N;
    int a[N];
    ll ans=0;
    for(int i=0;i<N;i++){
        cin >> a[i];
        ans+=mod_pow(x,a[i]);
        ans%=MOD;
    }
    cout << ans << endl;
}