import java.util.*;
import java.lang.*;
import java.io.*;

// this example class

class Father {
    int a,b;
    void daughterAge(int a) {
       // a=a;// ab yyha confuse hp jayega kyuki 2 a hai 
        this.a=a; // ab 
        System.out.println(this.a);;
    }

    int returnDaughterAge(){
        return a;
    }
}

// super example class
class Mobile{
String name ; 
int camera,storage;
    
     void Specification (String name,int camera,int storage){
         this.name = name;
         this.storage = storage;
         this.camera = camera;
         
         
     }    
       void   camera (){
           System.out.println("1st camera specification \n"+camera+"M.P");
           
       }
}
 
class Mobile2 extends Mobile{
    void camera2(){
        int camera2 = camera/2; 
        System.out.println("2nd camera specification \n"+camera2+"M.P");
    }
    
} 

class Main {
    public static void main(String[] args) {
        System.out.println("Hello world!");
     /*
        Father child1 = new Father();
        child1.daughterAge(17);
        System.out.println(child1.returnDaughterAge());
*/
    // object for mobile class
        Mobile redmi = new Mobile();
        redmi.Specification("mi",64,256);
        redmi.camera();
        // mobile2 class
        Mobile2 samsung = new Mobile2();
        
        
        
    }
}