/* -*- coding: utf-8 -*-
 *
 * 2275.cc:  No.2275 →↑↓ - yukicoder
 */

#include<cstdio>
#include<algorithm>
 
using namespace std;

/* constant */

const int MAX_N = 200000;
const int MOD = 998244353;

/* typedef */

typedef long long ll;

/* global variables */

int as[MAX_N];

/* subroutines */

/* main */

int main() {
  int n;
  scanf("%d", &n);
  for (int i = 0; i < n; i++) scanf("%d", as + i);

  int p = 1;
  for (int i = 0; i + 1 < n; i++)
    p = (ll)p * min(as[i], as[i + 1]) % MOD;

  printf("%d\n", p);
  return 0;
}