#include <bits/stdc++.h>
using namespace std;
long long mod=998244353;
long long  Y(long long a,long long p,long long mod){
  long long j=1;
  for(int i=1;i<=p;i++)j=(j*a)%mod;
  return j;
}    
int main(){
    int H,W,M;
    cin>>H>>W>>M;
    long long answer=0;
    for(long long i=1;i<=M;i++){
        answer=answer+(Y(M-i+1,H,mod)-Y(M-i,H,mod))*(Y(M-i+1,W,mod)-Y(M-i,W,mod));
        answer=answer%mod;
    }
    cout<<answer;
    
    
}