#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
//using mint = modint1000000007;
//const int mod = 1000000007;
using mint = modint998244353;
const int mod = 998244353;
//const int INF = 1e9;
//const long long LINF = 1e18;
//const bool debug = false;
#define rep(i, n) for (int i = 0; i < (n); ++i)
#define rep2(i,l,r)for(int i=(l);i<(r);++i)
#define rrep(i, n) for (int i = (n-1); i >= 0; --i)
#define rrep2(i,l,r)for(int i=(r-1);i>=(l);--i)
#define all(x) (x).begin(),(x).end()
#define allR(x) (x).rbegin(),(x).rend()
#define endl "\n"
#define P pair<int,int>
template<typename A, typename B> inline bool chmax(A & a, const B & b) { if (a < b) { a = b; return true; } return false; }
template<typename A, typename B> inline bool chmin(A & a, const B & b) { if (a > b) { a = b; return true; } return false; }

int main() {
	ios::sync_with_stdio(false);
	cin.tie(nullptr);
	int n; cin >> n;
	vector<int>p(n), pos(n), l(n), r(n);
	rep(i, n)cin >> p[i];
	rep(i, n)pos[p[i]] = i;
	rep(i, n) {
		if (0 == i) {
			l[i] = pos[i];
			r[i] = pos[i];
		}
		else {
			l[i] = min(l[i - 1], pos[i]);
			r[i] = max(r[i - 1], pos[i]);
		}
	}
	mint ans = 1;
	rep2(i, 1, n) {
		if ((l[i] == l[i - 1]) && (r[i] == r[i - 1])) {
			ans *= (r[i] - l[i] + 1 - i);
		}
	}
	cout << ans.val() << endl;
	return 0;
}