#include <bits/stdc++.h>

using namespace std;
#define int long long
#define app push_back
#define all(x) (x).begin(),(x).end()
#ifdef LOCAL
#define debug(...) [](auto...a){ ((cout << a << ' '), ...) << endl;}(#__VA_ARGS__, ":", __VA_ARGS__)
#else
#define debug(...)
#endif
#ifdef LOCAL
#define __int128 long long
#endif // LOCAL
const int p=998244353;
int c2(int n) {return (n*(n-1)/2)%p;}
int32_t main()
{
    ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
    int h,w;cin>>h>>w;
    int ans=4*c2(h/2+1)*c2(w/2+1);ans%=p;
    ans+=2*h*c2(w/2+1);ans%=p;ans+=2*w*c2(h/2+1);ans%=p;
    cout<<((2*c2((h*w)%p)-ans)%p+p)%p;
    return 0;
}