H,W=map(int,input().split())
result=0
mod=998244353
k=(H-1)//2
result+=(H*((H-1)//2)+2*k*(k+1)//2)*W**2
if H%2==1:
  result-=k*W**2
result%=mod
k=(W-1)//2
result+=(W*((W-1)//2)+2*k*(k+1)//2)*H**2
if W%2==1:
  result-=k*H**2
result%=mod
for i in range(0):
  x=(H-1)//2+min(i,H-1-i)
  y=W
  result+=0
for j in range(0):
  x=H
  y=(W-1)//2+min(j,W-1-j)
  result+=0
mod=998244353
k=(H-1)//2
w1=(H*((H-1)//2)+2*k*(k+1)//2)
if H%2==1:
  w1-=(H-1)//2
k=(W-1)//2
w2=(W*((W-1)//2)+2*k*(k+1)//2)
if W%2==1:
  w2-=(W-1)//2
result-=w1*w2
result%=mod
print(result)