A,B=(int(x) for x in input().split())
a=list(bin(A))[2:][::-1]
b=list(bin(B))[2:][::-1]

ans=1
for i in range(10):
    a.append(0)
    b.append(0)

for i,j in zip(a,b):
    i = int(i)
    j = int(j)
    if i == 1 and j == 0:
        ans *= 0
    elif i == 1 and j == 1:
        ans *= 2
    elif i == 0 and j == 0:
        ans *= 1
    else:
        ans *= 1

print(ans)