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 string[] SList(long n) => Enumerable.Repeat(0, (int)n).Select(_ => ReadLine()).ToArray();
    public static void Main()
    {
        Solve();
    }
    static void Solve()
    {
        var n = long.Parse(ReadLine());
        if (n > 1_200_000) return;
        var ans = 0L;
        var mod = 998_244_353;
        for (var j = 1; j <= n; ++j)
        {
            var cnt = n - j + 1;
            var max = (cnt + j - 1) / j;
            var maxcnt = (cnt + j - 1) % j + 1;
            ans = (ans +
                max * (max + 1) / 2 % mod * maxcnt % mod +
                max * (max - 1) / 2 % mod * (j - maxcnt) % mod) % mod;
        }
        WriteLine(ans);
    }
}