#include <bits/stdc++.h>
using namespace std;
using ll = long long;
constexpr ll mod = 998244353;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    map<ll, ll> cnt;
    ll n, ans = 0;
    cin >> n;
    vector<ll> a(n);
    for (auto& x : a) cin >> x;
    for (ll i = 0; i < n; i++) {
        cnt[a[i]]++;
        cnt[a[i]] += cnt[a[i] - 1];
        cnt[a[i]] %= mod;
    }
    for (auto& i : cnt) ans = (ans + i.second) % mod;
    ans = (ans + mod - n) % mod;
    cout << ans << '\n';
}