#include <bits/stdc++.h>
using namespace std;
#include <atcoder/all>
using namespace atcoder;
using ll=long long;
using Graph=vector<vector<int>>;
#define INF 1000000000000000000
#define MOD 998244353
#define MAX 1000000

int main(){
  ll a,b,N;
  cin>>a>>b>>N;
  if(a==b||a==0||b==0){
    cout<<0<<'\n';
    return 0;
  }
  ll x1=a;
  ll y1=b;
  ll x2,y2;
  while(true){
    x2=x1;
    y2=y1;
    while(y2*b>a*x2){
      x2+=b;
      y2-=a;
    }
    if(y2*b==a*x2){
      break;
    }
    x1+=a;
    y1+=b;
  }

  ll X=x2;
  ll Y=y1;
  ll ans=(max<ll>(0,N-X)%MOD)*(max<ll>(0,N-Y)%MOD)%MOD;
  ans*=8;
  ans%=MOD;
  cout<<ans<<'\n';

}