#include <bits/stdc++.h>
using namespace std;
#include <atcoder/all>
using namespace atcoder;
using mint = modint998244353;
int main () {
	int N;
	cin >> N;
	std::vector<int> A(N) ;
	for (auto& a : A) cin >> a;
	int M = 100000;
	A.push_back(0);
	for (int i = 1; i <= N; i ++) {
		M -= max(0, A[i - 1] - A[i]);
	}
	if (M < 0) {
		puts("0");
		return 0;
	}
	mint a = 1, b = 1, c = 1;
	for (int i = 1; i <= M + N; i ++) {
		a *= i;
	}
	for (int i = 1; i <= N; i ++) {
		b *= i;
	}
	for (int i = 1; i <= M; i ++) {
		c *= i;
	}
	cout << (a / b / c).val() << endl;
}