print(pow(2, sum(map(int, input().split())), 998244353))
#include<bits/stdc++.h>
using namespace std;
long long mod = 998244353;
long long power(long long a, long long n)
{
if(n == 0)
return 1;
if(n%2 == 0)
{
long long x = power(a, n / 2);
return ((x % mod) * (x % mod)) % mod;
}
else
{
long long x = power(a, n / 2);
return ((x*x)%mod*(a%mod))%mod;
}
}
int main()
{
long long h, w;
cin >> h >> w;
long long ans = power(2, h + w);
cout << ans << endl;
}
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