try.rb

	n = gets.chomp.to_i

	v = []

	n.times do
		temp = gets.chomp.to_i
		v.push temp
	end

	v.sort!

	v.reverse!

	sig = 1
	 
	while sig <= v[0] 
	    sig<<=1;
	end
	    
	sig>>=1;

	t = 0

	while sig >= 1
	 
		i = t
	 
		while (i<n) && (v[i]&sig)==0
			i+=1
		end
	 
		if i>=n
			sig>>=1
			next
		end
	 
		v[t],v[i] = v[i], v[t]
	 
		j = 0

		while j < n
	 
			if j!=t && (v[j]&sig)!=0
				v[j] = v[j]^v[t]
			end

			j+=1
		end
	 
		t+=1
	 
		sig>>=1
	 
	end

	res = 0
	 
	q = 0

	while q < n
		res = res^v[q]
		q+=1
	end
	 
	print res