#include "testlib.h"
#include <bits/stdc++.h>
using namespace std;
#include <atcoder/modint>
using namespace atcoder;
using mint = modint998244353;
using ll = long long;
const int MAX_N = 3'000;
const int MAX_M = 3'000;

const ll INF = 1LL << 60;
using p2 = pair<ll, int>;
template<class T, class U> bool chmin(T& a, U b) { return a > b ? a = b, 1 : 0; }

int main(int argc, char* argv[]) {
    registerValidation(argc, argv);
    int N = inf.readInt(1, MAX_N, "N");
    inf.readSpace();
    int M = inf.readInt(1, MAX_M, "M");
    inf.readEoln();
    inf.readEof();
    cout << ((mint)2).pow(N*M-1).val() << endl;
}