#include<bits/stdc++.h> namespace { #pragma GCC diagnostic ignored "-Wunused-function" #include<atcoder/all> #pragma GCC diagnostic warning "-Wunused-function" using namespace std; using namespace atcoder; #define rep(i,n) for(int i = 0; i < (int)(n); i++) #define rrep(i,n) for(int i = (int)(n) - 1; i >= 0; i--) #define all(x) begin(x), end(x) #define rall(x) rbegin(x), rend(x) template<class T> bool chmax(T& a, const T& b) { if (a < b) { a = b; return true; } else return false; } template<class T> bool chmin(T& a, const T& b) { if (b < a) { a = b; return true; } else return false; } using ll = long long; using P = pair<int,int>; using VI = vector<int>; using VVI = vector<VI>; using VL = vector<ll>; using VVL = vector<VL>; using mint = modint998244353; } int main() { ios::sync_with_stdio(false); cin.tie(0); int h, w; cin >> h >> w; mint h2 = h / 2, w2 = w / 2, bh = h % 2, bw = w % 2; mint ans = h2*h2*w2*w2*15+h2*h2*w2*bw*16+h2*w2*w2*bh*16+h2*w2*bh*bw*16-h2*h2*w2*3+h2*h2*bw*3-h2*w2*w2*3+h2*bh*bw*4+w2*w2*bh*3+w2*bh*bw*4-h2*w2*9-h2*bw*3-w2*bh*3; cout << ans.val() << '\n'; }