#include <bits/stdc++.h>
#include <atcoder/modint>
using namespace std;
using mint = atcoder::modint998244353;
int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int N;
    cin >> N;
    map<int, mint> dp;
    for (int i = 0; i < N; i++) {
        int A;
        cin >> A;
        dp[A] += dp[A - 1] + 1;
    }
    mint ans = -N;
    for (auto [key, val] : dp) ans += val;
    cout << ans.val() << endl;
}