#include <iostream>
using namespace std;

class Point{
      public:
             friend void ChangePrivate(Point &);
             Point(void):m(0){}
             void PrintPrivate(void){cout<<m<<endl;}
             
      private:
              int m;
      
      };
      
void ChangePrivate(Point &i){
     i.m++;
     
     }
     
     
int main(){
    Point sPoint;
    sPoint.PrintPrivate();
    ChangePrivate(sPoint);
    sPoint.PrintPrivate();
    getchar();
    return 0;
}