Mod=998244353
H,W=map(int,input().split())
X=0
Y=0
t=(H+2)//2
X+=(t)*(t-1)//2
t=H-(H+1)//2+1
X+=(t)*(t-1)//2
X+=H

t=(W+2)//2
Y+=(t)*(t-1)//2
t=W-(W+1)//2+1
Y+=(t)*(t-1)//2
Y+=W
print(((H*W)**2-X*Y)%Mod)