using System;
using static System.Console;
using System.Linq;
using System.Collections.Generic;

class Program
{
    static int NN => int.Parse(ReadLine());
    static int[] NList => ReadLine().Split().Select(int.Parse).ToArray();
    static void Main()
    {
        var n = NN;
        var a = NList;
        var mod = 998_244_353;
        var ncnt = new Dictionary<int, long>();
        var ecnt = new Dictionary<int, long>();
        for (var i = 0; i < n; ++i)
        {
            var add = 0L;
            if (ncnt.ContainsKey(a[i] - 1))
            {
                add = (ncnt[a[i] - 1] + ecnt[a[i] - 1]) % mod;
            }
            if (ncnt.ContainsKey(a[i]))
            {
                ncnt[a[i]] += 1;
                ecnt[a[i]] = (ecnt[a[i]] + add) % mod;
            }
            else
            {
                ncnt[a[i]] = 1;
                ecnt[a[i]] = add;
            }
        }
        var res = 0L;
        foreach (var kv in ecnt) res = (res + kv.Value) % mod;
        WriteLine(res);
    }
}