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

const int INF = 1e9;
const int MOD = 1e9+7;
const ll LINF = 1e18;

#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define REP(i,n) for(int i=0;i<(n);++i)
#define REPR(i,n) for(int i=n;i>=0;i--)
#define ALL(v) (v.begin(),v.end())
#define COUT(x) cout<<(x)<<'\n'

template<class T> inline bool chmin(T& a, T b) {
    if (a > b) {
        a = b;
        return true;
    }
    return false;
}
template<class T> inline bool chmax(T& a, T b) {
    if (a < b) {
        a = b;
        return true;
    }
    return false;
}
//二条累乗法
int binpow(int z,int y){//xは変数,yは累乗
    ll num = 1;
    while(y!=0){
        if(y%2==0){
            z*=z; y/=2;
        }
        else{
            num*=z;y--;
        }
        if(num>1000003)num%=1000003;
    }
    return num;
}

int main(){
    int x,n,a;
    cin >> x >> n;
    ll ans = 0;
    REP(i,n){
        cin >> a;
        ans += binpow(x,a);
        if(ans>1000003)ans%=1000003;
    }
    COUT(ans);
    return 0;
}