G=[-1]*60
def g(n):
	if n<60 and G[n]>=0:return G[n]
	f=[0]*60
	d=0
	m=n
	while m!=0:
		if m%2==1:f[g(d)]=1
		d+=1
		m>>=1
	a=0
	while f[a]==1:a+=1
	if n<60:G[n]=a
	return a
i=input
N=range(int(i()))
e=1
a=0
A=i().split()
for n in N:
	B=int(A[n])
	if B<0:e=1-e
	else:a^=g(B)
print(2 if e==1 and a==0 else 1)