import sys
sys.setrecursionlimit(5*10**5)
input = sys.stdin.readline
from collections import defaultdict, deque, Counter
from heapq import heappop, heappush
from bisect import bisect_left, bisect_right
from math import gcd

h,w = map(int,input().split())

if h % 2 == 0:
    hh = h//2-1
else:
    hh = h//2
    
if w % 2 == 0:
    ww = w//2-1
else:
    ww = w//2

all = ((1+hh)*hh//2) * ((1+ww)*ww//2) * 4
lh = h-hh*2
lw = w-ww*2
all += ((1+ww)*ww//2) * h * lh * 2
all += ((1+hh)*hh//2) * w * lw * 2
all += h*w *lh*lw

ans = (h*w)**2 - all 

print(ans%998244353)