import sys
input = lambda :sys.stdin.readline()[:-1]
ni = lambda :int(input())
na = lambda :list(map(int,input().split()))
yes = lambda :print("yes");Yes = lambda :print("Yes")
no = lambda :print("no");No = lambda :print("No")
#######################################################################
def f(x, y):
    if x % 2 and y % 2:
        x //= 2
        y //= 2
        return 0+1*y+3*y*y+1*x+7*x*y+13*x*y*y+3*x*x+13*x*x*y+15*x*x*y*y
    if x % 2 and y % 2 == 0:
        x //= 2
        y //= 2
        y -= 1
        return 0+3*y+3*y*y+4*x+17*x*y+13*x*y*y+12*x*x+27*x*x*y+15*x*x*y*y
    if x % 2 == 0 and y % 2:
        x //= 2
        y //= 2
        x -= 1
        return 0+4*y+12*y*y+3*x+17*x*y+27*x*y*y+3*x*x+13*x*x*y+15*x*x*y*y
    if x % 2 == 0 and y % 2 == 0:
        x //= 2
        y //= 2
        x -= 1
        y -= 1
        return 0+12*y+12*y*y+12*x+39*x*y+27*x*y*y+12*x*x+27*x*x*y+15*x*x*y*y
h,w = na()

print(f(h,w)%998244353)