#include<bits/stdc++.h>
#include<atcoder/all>
using namespace std;
using namespace atcoder;
#define rep(i,n)for (int i = 0; i < int(n); ++i)
#define rrep(i,n)for (int i = int(n)-1; i >= 0; --i)
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
template<class T> void chmax(T& a, const T& b) {a = max(a, b);}
template<class T> void chmin(T& a, const T& b) {a = min(a, b);}
using ll = long long;
using P = pair<int,int>;
using VI = vector<int>;
using VVI = vector<VI>;
using VL = vector<ll>;
using VVL = vector<VL>;
using mint = modint998244353;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    int n;
    cin >> n;
    VI p(n);
    rep(i, n) cin >> p[i];
    VI ord(n);
    rep(i, n) ord[p[i]] = i;
    int l = ord[0], r = ord[0];
    int unused = 0;
    mint ans = 1;
    for(int i = 1; i < n; i++) {
        int p = ord[i];
        if (p < l) unused += l - p - 1, l = p;
        else if (p > r) unused += p - r - 1, r = p;
        else ans *= unused, unused--;
    }
    cout << ans.val() << endl;
}