#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using i64 = long long;
#define var auto

int main() {
    cin.tie(0)->sync_with_stdio(false);
    ll h, w;
    cin >> h >> w;
    const ll mod = 998244353;
    ll a = (h - 1) / 2;
    ll b = (w - 1) / 2;
    ll x = 2 - h % 2;
    ll y = 2 - w % 2;
    ll aa = (a * (a + 1) / 2) % mod;
    ll bb = (b * (b + 1) / 2) % mod;
    ll ans = aa * bb % mod * 4 % mod;
    ans += y * w % mod * aa % mod * 2 % mod;
    ans += x * h % mod * bb % mod * 2 % mod;
    ans += x * y % mod * h % mod * w % mod;
    ans %= mod;
    ll all = h * w % mod * h % mod * w % mod;
    cout << (all + mod - ans) % mod << endl;
}