#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
const ll mod = 998244353;

ll modpow(ll a, ll n, ll MOD = mod) {
    if(n == 0) {
        return 1;
    }
    if(n%2 == 1) {
        return (a * modpow(a, n-1, MOD)) % MOD;
    }
    return (modpow(a, n/2, MOD) * modpow(a, n/2, MOD)) % MOD;
}  
int main(){
    int H,W,M;
    cin>>H>>W>>M;
    long long answer=0;
    for(int i=1;i<=M;i++){
        answer=answer+(modpow(M-i+1,H,mod)-modpow(M-i,H,mod))*(modpow(M-i+1,W,mod)-modpow(M-i,W,mod));
      answer=answer%mod;
    }
    cout<<answer;
    
    
}