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

// The main method must be in a class named "Main".
class Main {
   
   static int sum (int x , int y) {
       int z;
       
       if ( x>y)
      z= x+y;
      else
      z= x-y;
      
      return z;
  }
   
   static void change(int s){
   // void hum tb use krte jb hume koi return nhi chahiye ho
       s = 66;
       
   }
   
   
   
    public static void main(String[] args) {
        System.out.println("Hello world!");
  
    
     int a,b,c;
     a= 6;
     b=77;
     
     //ab yha bar bar hum woh logic nhi likhenge 
  
     c= sum(a,b);
     System.out.println(c);
  
  
     
     int a1= 77;
     int b1 = 67;
      int c1= sum(a1,b1);
    System.out.println(c1);
  
 
  
  
  
  
  
  // value change or not in array 
  
  int b3 = 13;
  
  
  change (b3);
  System.out.println(b3);
  
  
  
  
  
  
  
  
    }
}