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C.cpp
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C.cpp
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#include <bits/stdc++.h>
using namespace std;
#define pb push_back
#define mp make_pair
#define lb lower_bound
#define ub upper_bound
#define ff first
#define ss second
#define rep(i, a, b) for(int i = a; i < b; i++)
#define repR(i, a, b) for (int i = a; i >= b; --i)
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define sz(x) (int)(x).size()
#define mem1(a) memset(a,-1,sizeof(a))
#define mem0(a) memset(a,0,sizeof(a))
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
#define vi vector<int>
#define vvi vector<vi>
#define vll vector<ll>
#define vvll vector<vll>
#define vs vector<string>
#define vb vector<bool>
#define vpii vector<pii>
#define vpll vector<pll>
#define mod 998244353
#define ps(x,y) fixed << setprecision(y) << x
#define fastio ios_base::sync_with_stdio(false),cin.tie(NULL),cout.tie(NULL)
int mult(int a, int b)
{
int res = (a * 1LL * b) % mod;
if (res < 0) {
res += mod;
}
return res;
}
int power(int a, int b)
{
int res = 1;
while (b) {
if (b % 2 == 1) {
res = mult(a, res);
}
a = mult(a, a);
b /= 2;
}
return res;
}
void solve()
{
int w, h;
cin >> w >> h;
cout << power(2, w + h) << '\n';
}
int main()
{
fastio;
/*#ifndef ONLINE_JUDGE
freopen("input.txt","r",stdin);
freopen("output.txt","w",stdout);
#endif*/
int t = 1;
//cin>>t;
while (t--) solve();
return 0;
}