#include<bits/stdc++.h>
namespace {
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wunused-function"
#include<atcoder/all>
#pragma GCC diagnostic pop
using namespace std;
using namespace atcoder;
#define rep(i,n)for (int i = 0; i < int(n); ++i)
#define rrep(i,n)for (int i = int(n)-1; i >= 0; --i)
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
template<class T> void chmax(T& a, const T& b) { a = max(a, b); }
template<class T> void chmin(T& a, const T& b) { a = min(a, b); }
using ll = long long;
using P = pair<int,int>;
using VI = vector<int>;
using VVI = vector<VI>;
using VL = vector<ll>;
using VVL = vector<VL>;
using mint = modint998244353;


} int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  int h, w, m;
  cin >> h >> w >> m;
  mint ans;
  for (int mn = 0; mn < m; mn++) {
    mint t = 1;
    for (int x : {h, w}) {
      t *= mint(m - mn).pow(x) - mint(m - mn - 1).pow(x);
    }
    ans += t;
  }
  cout << ans.val() << '\n';
}