using System;
using System.Collections.Generic;

namespace test
{
    static class Program
    {
        static void Main()
        {
            long n = long.Parse(Console.ReadLine());
            string[] astr = Console.ReadLine().Split(' ');
            long[] a = new long[n];
            for(int i = 0; i < n; i++)
            {
                a[i] = long.Parse(astr[i]);
            }
            Dictionary<long,long> dict = new Dictionary<long,long>();
            for (int i = 0; i < n; i++)
            {
                if (dict.ContainsKey(a[i] - 1))
                {
                    if (dict.ContainsKey(a[i]))
                    {
                        dict[a[i]] = (dict[a[i]] +dict[a[i] - 1] + 1)%998244353;
                    }
                    else
                    {
                        dict.Add(a[i], (dict[a[i] - 1] + 1)%998244353);
                    }
                }
                else
                {
                    if (dict.ContainsKey(a[i]))
                    {
                        dict[a[i]] = (dict[a[i]]+1)%998244353;
                    }
                    else
                    {
                        dict.Add(a[i], 1);
                    }
                }
            }
            long count = 0;
            foreach (var item in dict)
            {
                count += item.Value;
            }
            Console.WriteLine((count - n+998244353)%998244353);
        }
    }
}