a,b = map(int, input().split())

cnt = 0
for i in range(8):
	ai = (a >> i) & 1
	bi = (b >> i) & 1
	if (ai == 1) & (bi == 0):
		print(0)
		exit()
	
	if (ai == 1) & (bi == 1):
		cnt += 1

print(pow(2, cnt))