N,K = map(int,input().split())

ans = c = 0
R = N - K

while(R or K):
	a = R & 1
	b = K & 1
	if(a + b + c >= 2):
		ans += 1
		c = 1
	else:
		c = 0
	R >>= 1
	K >>= 1

print(ans)