#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
#include <string>
using namespace std;

class test
{
public :
    int x;

    test(const test &obj)
    {
        x = obj.x + 1;
    }
    test(int y)
    {
        x = y;
    }
    test& operator= (const test &obs)

    {
        this->x = obs.x;
        return *this;
    }
};

int main() {
    test a(1);
    test b(3);
    b = a;
    cout << b.x;
}