#include<iostream>
#include<sstream>
#include<cstdio>
#include<cstring>
#include<string>
#include<vector>
#include<list>
#include<queue>
#include<utility>
#include <fstream>
#include<set>
#include<map>
#include<cctype>
#include<cmath>
#include<algorithm>
using namespace std;


#define RALL(x) (x).rbegin(),(x).rend()
#define ALL(x) (x).begin(),(x).end()
#define repp(i,n) for(int (i)=1;(i)<=(n);(i)++)
#define rep(i,n) for(int (i)=0;(i)<(n);(i)++)
#define rev(i,n) for(int (i)=(n-1);(i)>=0;(i)--)
#define clr(a) memset((a), 0 ,sizeof(a))

typedef pair<int,int> P;
typedef vector<pair<int,string> > pii;
typedef map<string,int> mdi;


const int mod=1e6+3;
long long mod_pow(long long x, int n){
	long long res =1;
	while(n){
		if(n&1) res = res*x%mod;
		x= x*x%mod;
		n/=2;
	}
	return res;
}


int main(){
	long long x,n;
	cin >> x >> n;
	long long ans =0;
	for(int i=0;i<n;i++){
		long long k;
		cin >> k;
		ans += mod_pow(x,k);
	}
	cout << ans%mod << endl;
	return 0;
}