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

// The main method must be in a class named "Main".
class Main {
    public static void main(String[] args) {
   
  /*    int a= 2;
       while (a<8)
   
      {
       
        System.out.println("a");
         a++;
        
        }
        */
   
   
   // natural no. 10 to 100
/*
   int b = 10;
   while (b<=100)
   {
   System.out.println(b);
   b++;
   }
   */
   
   // sum of  n even number 
   
    int a= 0;
                  //even no formula= 2n odd = 2n+1
    int n= 9;     // n even number 
    int sum= 0;
    while (a<n)
  {
  System.out.println(2*a);
    sum = sum + 2*a;
      a++;
  } 
 
  
      System.out.println("sum of even no. is "+sum);
     
        
        
        
    }
}