#include <iostream>
using namespace std;
class A
{
public:
int x;
A(int a)
// parameterized constructor.
{
x=a;
}
A(A &i)
// copy constructor
{
x = i.x;
}
};
int main()
{
A a1(20);
// Calling the parameterized constructor.
A a2(a1);
// Calling the copy constructor.
cout<<a2.x;
return 0;
}