#include <bits/stdc++.h>
#include <atcoder/all>
#pragma GCC target("avx2")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
using namespace std;
using namespace atcoder;
using ll=long long;using ull=unsigned long long;
using uint=unsigned int;using ld=long double;
#define MINT998244353
//#define MINT1000000007
//#define STATIC_MINT
constexpr ll INF=1000000001000000001;
constexpr int IINF = 1001001001;
#ifdef MINT998244353
    constexpr ll MOD=998244353;using mint=modint998244353;
#elif defined(MINT1000000007)
    constexpr ll MOD=1000000007;using mint=modint1000000007;
#elif defined(STATIC_MINT)
    constexpr ll MOD=998244353;using mint=static_modint<MOD>;
#else
    using mint=modint;
#endif
using pii=pair<int,int>;using pil=pair<int,ll>;using pli=pair<ll,int>;using pll=pair<ll,ll>;
using vi=vector<int>;using vvi=vector<vi>;using vvvi=vector<vvi>;
using vl=vector<ll>;using vvl=vector<vl>;using vvvl=vector<vvl>;using vvvvl=vector<vvvl>;
using vd=vector<double>;using vvd=vector<vd>;using vvvd=vector<vvd>;
using vm=vector<mint>;using vvm=vector<vm>;using vvvm=vector<vvm>;using vvvvm=vector<vvvm>;
template<class T>using vc=vector<T>;template<class T>using vvc=vector<vc<T>>;
#define rep(...) GET_MACRO(__VA_ARGS__,rep4,rep3,rep2)(__VA_ARGS__)
#define rrep(...) GET_MACRO(__VA_ARGS__,rrep4,rrep3,rrep2)(__VA_ARGS__)
#define GET_MACRO(_1, _2, _3, _4, NAME, ...) NAME
#define rep2(i,N) for(ll i=0;i<N;++i)
#define rep3(i,N,M) for(ll i=N;i<M;++i)
#define rep4(i,N,M,D) for(ll i=N;i<M;i+=D)
#define rrep2(i,N) for(ll i=N-1;i>=0;--i)
#define rrep3(i,M,N) for(ll i=N-1;i>=M;--i)
#define rrep4(i,M,N,D) for(ll i=N-1;i>=M;i-=D)
#define ALL(A) A.begin(),A.end()
#define RALL(A) A.rbegin(),A.rend()
#define UNIQUE(A) A.erase(unique(ALL(A)), A.end())
#define len(x) (int)x.size()
template<typename T> using min_priority_queue=priority_queue<T,vector<T>,greater<T>>;
template<class T> inline bool chmin(T& a,T b){if(a>b){a=b;return true;}return false;}
template<class T> inline bool chmax(T& a,T b){if(a<b){a=b;return true;}return false;}
#define Yes cout<<"Yes\n"
#define No cout<<"No\n"
#define YES cout<<"YES\n"
#define NO cout<<"NO\n"
inline void YesNo(bool ok){if(ok){Yes;}else{No;}}
inline void YESNO(bool ok){if(ok){YES;}else{NO;}}
constexpr int dx[]={1,0,-1,0,1,1,-1,-1};
constexpr int dy[]={0,1,0,-1,1,-1,1,-1};
istream &operator>>(istream &is, mint &a){ll v;is>>v;a=v;return is;}
ostream &operator<<(ostream &os, const mint &a){return os<<a.val();}
template<class T> istream &operator>>(istream &is,vector<T> &v){for(auto &e:v)is>>e;return is;}
template<class T> ostream &operator<<(ostream &os,const vector<T> &v){for(auto &e:v)os<<e<<' ';return os;}
#define Assert(b) {if(!(b)){cerr<<"fuck";vc<char> MLE(1<<30);rep(i,9)cout<<MLE[i];exit(0);}}
#define endl '\n'

void main_(){
    int N,M;
    cin>>N>>M;
    cout<<mint(2).pow(N*M-1)<<endl;
}
int main(){
    ios::sync_with_stdio(false);cin.tie(nullptr);cout<<setprecision(12);
    int T = 1;
    // cin>>T;
    while(T--) main_();
}