#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
#define rep(i, n) for(int i=0;i<(n);++i)
#define rep1(i, n) for(int i=1;i<=(n);i++)
#define ll long long
using mint = modint998244353;
using P = pair<ll,ll>;
using lb = long double;
using T = tuple<ll, ll, ll>;
#ifdef LOCAL
#  include <debug_print.hpp>
#  define dbg(...) debug_print::multi_print(#__VA_ARGS__, __VA_ARGS__)
#else
#  define dbg(...) (static_cast<void>(0))
#endif

int main()
{
    ll h, w;
    cin >> h >> w;
    ll W = (w-1)/2;
    ll H = (h-1)/2;
    mint ans = mint(h)*mint(h)*(mint(w)*(mint(w)-1)/2 - (mint(w)-mint(W))*(mint(w)-mint(W)-1)/2)*2;
    ans += mint(w)*mint(w)*(mint(h)*(mint(h)-1)/2 - (mint(h)-H)*(mint(h)-H-1)/2)*2;
    ans -= 4*(mint(w)*(mint(w)-1)/2 - (mint(w)-mint(W))*(mint(w)-mint(W)-1)/2) * (mint(h)*(mint(h)-1)/2 - (mint(h)-H)*(mint(h)-H-1)/2);
    cout << ans.val() << endl;
    return 0;
}