#include<iostream>
#include<algorithm>
#include<vector>
using namespace std;
using ll=long long;
#define all(v) v.begin(),v.end()
#define rall(v) v.rbegin(),v.rend()
template<class T> bool chmax(T &a, T b){if (a < b){a = b;return true;} else return false;}
template<class T> bool chmin(T &a, T b){if (a > b){a = b;return true;} else return false;}

const int MOD=998244353;

int main(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    ll H,W;
    cin>>H>>W;
    ll ans=0;
    ll sh=((H/2-1)*(H/2)%MOD+(H%2?H/2:0))%MOD;
    ll sw=((W/2-1)*(W/2)%MOD+(W%2?W/2:0))%MOD;
    ans=(H*W-(H/2+1)*(W/2+1))%MOD*H%MOD*W%MOD;
    ans+=(W/2+1)*W%MOD*sh%MOD;
    ans+=(H/2+1)*H%MOD*sw%MOD;
    ans-=sh*sw%MOD;
    ans%=MOD;
    if(ans<0)ans+=MOD;
    cout<<ans<<"\n";
}