#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
#define ll long long
#define rep(i, n) for (int i = 0; i < (n); i++)
#define coutf(f) cout << fixed << setprecision(f)
#define all(v) (v).begin(), (v).end()
#define rall(v) (v).rbegin(), (v).rend()

using mint = modint998244353;
const int mod = 998244353;

int main() {
	int N, A[200010];
	cin >> N;
	rep(i, N) cin >> A[i];
	map<int, ll> mp;
	ll ans = 0;
	rep(i, N) {
		ans += mp[A[i] - 1] + 1;
		mp[A[i]] += mp[A[i] - 1] + 1;
		ans %= mod;
		mp[A[i]] %= mod;
	}
	cout << (ans + mod - N) % mod << "\n";
	return 0;
}