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

#define FOR(i, a, b) for(int i = (a); i < (b); i++)
#define RFOR(i, b, a) for(int i = (b) - 1; i >= (a); i--)
#define SZ(a) (int)a.size()
#define ALL(a) a.begin(), a.end()
#define PB push_back
#define MP make_pair
#define F first
#define S second

typedef long long LL;
typedef vector<int> VI;
typedef pair<int, int> PII;
typedef double db;


const int N = 1 << 12;
const int M = 2017;

int dp[N][4 * M];


int main()
{
	ios::sync_with_stdio(0); 
	cin.tie(0);
	cout << fixed << setprecision(15);
	
	int n;
	cin >> n;
	VI a(n);
	FOR(i, 0, n)
		cin >> a[i];
	RFOR(i, n - 1, 0)
		a[i] = min(a[i], a[i + 1]);
	
	int k = a[0] / M;
	FOR(i, 0, n)
		a[i] = min(4 * M - 1, a[i] - k * M);
	
	
	dp[0][0] = 1;
	FOR(i, 0, n)
	{
		int sum = 0;
		FOR(val, 0, a[i] + 1)
		{
			sum = (sum + dp[i][val]) % M;
			dp[i + 1][val] = sum;
		}
	}
	int ans = 0;
	FOR(i, 0, a[n - 1] + 1)
		ans = (ans + dp[n][i]) % M;
	
	cout << ans << endl;
	

		

	
	
	
	
	
	
	return 0;
}