int tongSucChua(CBlist l, int quy) {
	int tong = 0;
	NodeCB* cur = l.head;
	while (cur != NULL) {
		if (quy == 1) {
			if (cur->x.ngayBay.month >= 1 && cur->x.ngayBay.month <= 3) {
				tong += cur->x.succhua;
			}
		}
		else if (quy == 2) {
			if (cur->x.ngayBay.month >= 4 && cur->x.ngayBay.month <= 6) {
				tong += cur->x.succhua;
			}
		}
		else if (quy == 3) {
			if (cur->x.ngayBay.month >= 7 && cur->x.ngayBay.month <= 9) {
				tong += cur->x.succhua;
			}
		}
		else if (quy == 4) {
			if (cur->x.ngayBay.month >= 10 && cur->x.ngayBay.month <= 12) {
				tong += cur->x.succhua;
			}
		}
		cur = cur->next;
	}
	return tong;
}