#include <iostream>
#include <vector>
#include <algorithm>
#include <cmath>
#include <map>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
using ll = long long;
using mint = modint998244353;
using vi = vector<int>;
using vvi = vector<vi>;
using vvvi = vector<vvi>;
using vll = vector<ll>;
using vvll = vector<vll>;
using vvvll = vector<vvll>;
using vmi = vector<mint>;
using vvmi = vector<vmi>;
using vvvmi = vector<vvmi>;
#define all(a) (a).begin(), (a).end()
#define rep2(i, m, n) for (int i = (m); i < (n); ++i)
#define rep(i, n) rep2(i, 0, n)
#define drep2(i, m, n) for (int i = (m)-1; i >= (n); --i)
#define drep(i, n) drep2(i, n, 0)


int main(){
    int n; cin >> n;
    vi a(n); rep(i, n)cin >> a[i];
    map<int, mint> mp;
    mp[a[0]] = mint(1);
    rep2(i, 1, n){
        mp[a[i]] += mp[a[i]-1] + 1;
    }
    mint ans = mint(0);
    for(auto i : mp)ans += i.second;
    cout << (ans-n).val() << endl;

    return 0;
}