N = int(raw_input())
A = map(int, raw_input().split())
dp = [[0]]
for i in range(0, N):
	newdp = []
	for j in range(0, len(dp[i])):
		newdp.append(dp[i][j])
	for j in range(0, len(dp[i])):
		if dp[i][j] ^ A[i] not in newdp: newdp.append(dp[i][j]^A[i])
	dp.append(newdp)
print len(dp[N])