//нулевой xor
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

struct BTrie {
	struct BTrie *next[2];
	int v;
};

typedef struct BTrie BT;

int checkbit(unsigned int n, int b) {
	return (n & (1 << b)) >> b;
}

BT *initBT() {
	return calloc(1, sizeof(BT));
}

void addBT(BT *b, int v) {
	BT *p = b;
	for(int i = 0; i < sizeof(int) * 8; i++) {
		int bit = checkbit(v, i);
		if(!(p->next[bit]))
			p->next[bit] = calloc(1, sizeof(BT));
		p = p->next[bit];
	}
	if(!v && !p->v)
		p->v++;
	p->v++;
}

int forEachBT(BT *b, int level) {
	if(level) {
		int res = 0;
		if(b->next[0])
			res += forEachBT(b->next[0], level - 1);
		if(b->next[1])
			res += forEachBT(b->next[1], level - 1);
		return res;
	} else {
		int v = b->v - 1;
		return v * (v + 1) / 2;
	}
}

void freeBT(BT *b) {
	if(b->next[0])
		freeBT(b->next[0]);
	if(b->next[1])
		freeBT(b->next[1]);
	free(b);
}

int main(void) {
	int n, xor = 0;
	scanf("%d", &n);
	BT *bt = initBT();
	for(int i = 0; i < n; i++) {
		int tmp;
		scanf("%d", &tmp);
		xor ^= tmp;
		addBT(bt, xor);
	}
	printf("%d\n", forEachBT(bt, sizeof(int) * 8));
	freeBT(bt);
	return 0;
}