H, W = map(int, input().split())
h = H // 2 + 1
w = W // 2 + 1
ans = W * (H - h) * (H + h - 1) + H * (W - w) * (W + w - 1)
def calc(a, b) :
	return a * b * (a - 1) * (b - 1)
ans += calc(H, W) - calc(h, w)
print(ans % 998244353)