#include <stdio.h>

int main () {
  int n = 0;
  long long a = 0LL;
  
  int res = 0;
  
  long long ans = 1LL;
  long long mod_num = 998244353LL;
  
  long long prev = 0LL;
  
  res = scanf("%d", &n);
  res = scanf("%lld", &a);
  prev = a;
  for (int i = 1; i < n; i++) {
    res = scanf("%lld", &a);
    if (a > prev) {
      ans *= prev;
      ans %= mod_num;
    } else {
      ans *= a;
      ans %= mod_num;
    }
    prev = a;
  }
  
  printf("%lld\n", ans);
  return 0;
}