#include<iostream>
using std::cout;
// no connection

class Input {
int buff;
 public:
	void in(int val) { buff=val;}

};

class Output {
int buff;
 public:
	int out() { return buff;}

};

class UnsecuredIO : public Input, public Output { }; 


int main () {
 
 UnsecuredIO *u = new UnsecuredIO();
 Input *in = u;
 Output *out= u;

 in->in(25);
 int x = out->out();
 cout<<x << "\n";


}