#include<bits/stdc++.h> typedef uint64_t u64; typedef int64_t i64; using namespace std; template<u64 mod> struct modint{ u64 val; modint(i64 val_=0):val((val_%i64(mod)+i64(mod))%i64(mod)){} modint operator-(){ return (val==0)?0:mod-val; } modint operator+(modint rhs){ return modint(*this)+=rhs; } modint operator-(modint rhs){ return modint(*this)-=rhs; } modint operator*(modint rhs){ return modint(*this)*=rhs; } modint operator/(modint rhs){ return modint(*this)/=rhs; } modint operator^(i64 rhs){ return modint(*this)^=rhs; } modint &operator+=(modint rhs){ val+=rhs.val,val-=((val>=mod)?mod:0); return (*this); } modint &operator-=(modint rhs){ val+=((val<rhs.val)?mod:0),val-=rhs.val; return (*this); } modint &operator*=(modint rhs){ val=val*rhs.val%mod; return (*this); } modint &operator/=(modint rhs){ return (*this)*=rhs^(mod-2); } modint &operator^=(i64 rhs){ modint res=1,now=(*this); while(rhs){ res*=((rhs&1)?now:1),now*=now,rhs>>=1; } return (*this)=res; } bool operator==(modint rhs){ return val==rhs.val; } bool operator!=(modint rhs){ return val!=rhs.val; } friend std::ostream &operator<<(std::ostream& os,modint x){ return os<<(x.val); } friend std::istream &operator>>(std::istream& is,modint& x){ u64 t; is>>t,x=t; return is; } }; typedef modint<998244353> mint; mint f(int i,int H){ return (mint(i)^H)-(mint(i-1)^H); } int main(){ int H,W,M; cin>>H>>W>>M; mint ans=0; for(int i=1;i<=M;++i){ ans+=f(i,H)*f(i,W); } cout<<ans<<endl; }