class Student {
   static int totalStudents; /// total number of students present

	public :

	int rollNumber;
	int age;
    

    Student(){
       totalStudents++;
    }
    
    int getRollNumber(){
      return rollNumber;
    }
    
    static int getTotalSyudents(){
       return totalStudents;
    }

};

int Student::totalStudents = 0;  /// initialize static data members