/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		// your code goes here
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int arr[] = new int[n];
		for(int i=0; i<n ;i++){
			arr[i]=sc.nextInt();
		}
		int b = sc.nextInt();
 
		HashMap<Integer,Integer> hmap = new HashMap<>();
        int xor=0,count=0;
        for(int i=0; i<n; i++){
            xor = xor ^ arr[i];
            if(xor==b){
                count++;
            }
            count += hmap.getOrDefault(xor ^ b,0);
            hmap.put(xor, hmap.getOrDefault(xor,0)+1);
        }
        System.out.println(count);
	}
}

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NQo0IDIgMiA2IDQgCjY=

5
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