#include<bits/stdc++.h>
#include<atcoder/all>
using namespace std;
using ll = long long;
using mint = atcoder::modint998244353;

int main(){
    ll h, w; cin >> h >> w;
    mint a = h/2, b = w/2;
    mint ans = 2*a*b*(a+1+b+1) + a*(a+1)*b*(b+1);
    if (h % 2 == 1){
        ans += b*(b+1);
    }
    if (w % 2 == 1){
        ans += a*(a+1);
    }
    mint tot = h*w;
    ans = tot*(tot-1) - ans;
    cout << ans.val() << endl;
}