mod = 998244353

def calch(h):
  res = (H-1)*(h+1) - h*(h+1)//2
  res %= mod
  return res

def calcw(w):
  res = (W-1)*(w+1) - w*(w+1)//2
  res %= mod
  return res

def calc(h,w):
  res1 = calch(h)
  res2 = calcw(w)
  res = res1 * res2
  res %= mod
  return res

H,W = map(int,input().split())
HH = (H-1)//2 - 1
WW = (W-1)//2 - 1
ans = 0
# H軸に平行
ans += W*calch(HH)*2
ans %= mod
# W軸に平行
ans += H*calcw(WW)*2
ans %= mod
# どっちでもない
ans += (calc(H-1,WW) + calc(HH,W-1) - calc(HH,WW)) * 4
ans %= mod
print(ans)