#include <iostream>

using namespace std;

class ouch
{
private :
    long a;
public :
    ouch()
    {
        a = 0;
    }
    ~ouch() {}
    void incr(long n) const
    {
        a = a+n;
    }
    void print() const
    {
        cout << "a = " << a << endl;
    }
};