/*
 * Copyright (c) JoinQuant Development Team
 * Author: Huayong Kuang <kuanghuayong@joinquant.com>
 */

#include <iostream>

using namespace std;



int main(void)
{
    int a = 1;
    int &ref_a = a;
    const int &ref_1 = 1;
    int &ref_1 = 1;

    cout << a << endl;
    cout << ref_a << endl;
    cout << ref_1 << endl;
    return 0;
}