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 c = NList;
        var (h, w, m) = (c[0], c[1], c[2]);
        var res = 0L;
        for (var i = 1; i <= m; ++i)
        {
            res = (res + Calc(m, i, h) * Calc(m, i, w) % mod) % mod;
        }
        WriteLine(res);
    }
    static int mod = 998_244_353;
    static long Calc(int max, int min, int n)
    {
        if (n == 1) return 1;
        if (max == min) return 1;
        return (Exp(max - min + 1, n) - Exp(max - min, n) + mod) % mod;
    }
    static long Exp(long n, long k)
    {
        n = n % mod;
        if (k == 0) return 1;
        if (k == 1) return n;
        var half = Exp(n, k / 2);
        var result = (half * half) % mod;
        return ((k % 2) == 0) ? result : ((result * n) % mod);
    }
}