def muzyun(A,B):
    while A:
        if A & 1 == 1 and B & 1 !=1:
            return True
        A >>= 1
        B >>= 1
    return False

A, B = map(int,input().split())
if muzyun(A,B):
    print(0)
    exit()
ans = 0

C = A^B
while C:
    if C & 1 == 1:
        ans+=1
    C >>= 1

print(max(1,ans))