#include<bits/stdc++.h>
using namespace std;
#define inf 1000000000
#define INF 1000000000000000
#define ll long long
#define ull unsigned long long
#define M (int)(1e6+3)
#define P pair<int,int>
#define PLL pair<ll,ll>
#define FOR(i,m,n) for(int i=(int)m;i<(int)n;i++)
#define RFOR(i,m,n) for(int i=(int)m;i>=(int)n;i--)
#define rep(i,n) FOR(i,0,n)
#define rrep(i,n) RFOR(i,n,0)
#define all(a) a.begin(),a.end()
#define IN(a,n) rep(i,n){ cin>>a[i]; }
const int vx[4] = {0,1,0,-1};
const int vy[4] = {1,0,-1,0};
#define PI 3.14159265
#define F first
#define S second
#define PB push_back
#define EB emplace_back
#define int ll
void init(){
  cin.tie(0);
  ios::sync_with_stdio(false);
}



ll power(ll x,ll k){
  ll ret=1;
  while(k>0){
    if(k&1) (ret*=x) %= M;
    (x*=x) %= M;
    k >>= 1;
  }
  return ret;
}

int x,n;
int ans=0;

main(){
  cin>>x>>n;

  rep(i,n){
    int a;
    cin>>a;
    ans+=power(x,a);
    ans%=M;
  }

  cout<<ans<<endl;
}