/*
Things to notice:
1. do not calculate useless values
2. do not use similar names
 
Things to check:
1. submit the correct file
2. time (it is log^2 or log)
3. memory
4. prove your naive thoughts 
5. long long
6. corner case like n=0,1,inf or n=m
7. check if there is a mistake in the ds or other tools you use
8. fileio in some oi-contest

9. module on time 
10. the number of a same divisor in a math problem
11. multi-information and queries for dp and ds problems
*/
#include<bits/stdc++.h>
using namespace std;
#define int long long
#define fi first
#define se second
#define pii pair<long long,long long>
#define mp make_pair
#define pb push_back
const int mod=998244353;
const int inf=0x3f3f3f3f;
const int INF=1e18;
void solve()
{
	int n,m;
	cin>>n>>m; 
	int ans=n*m%mod*((n*m-1)%mod)%mod;
	if(m%2==0) ans=(ans-n*(2*m-2)%mod+mod)%mod;
	else ans=(ans-n*(m-1)%mod+mod)%mod;
	swap(n,m);
	if(m%2==0) ans=(ans-n*(2*m-2)%mod+mod)%mod;
	else ans=(ans-n*(m-1)%mod+mod)%mod;
	int lim1=(n+1)/2,lim2=(m+1)/2;
	n-=lim1-1,m-=lim2-1;
	n--,m--;
	n=n*(n+1)/2,n%=mod;
	m=m*(m+1)/2,m%=mod;
	ans=(ans-4LL*n*m%mod+mod)%mod;
	cout<<ans<<"\n";
}
signed main()
{
//	ios::sync_with_stdio(0);
//	cin.tie(0);
	int _=1;
//	cin>>_;
	while(_--) solve();
	return 0;
}