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

// The main method must be in a class named "Main".
class Main {
 
 static void check (int [] arr ) {
 arr [0]=73;
 
 
 }
 
 
 
   public static void main(String[] args) {
        System.out.println("Hello world!");
   
   
   
   
   
   
   
   int []marks ={626,6,56,5,57,5};
   
     check(marks);
 
    
    
    
    System.out.println(marks[0]);
   
   
   
   
   
   
   
   
    }
}