Problem:
﻿Score: 100 points

Problem Statement

In 2020, AtCoder Inc. with an annual sales of more than one billion yen (the currency of Japan) has started a business in programming education.

One day, there was an exam where a one-year-old child must write a program that prints Hello World, and a two-year-old child must write a program that receives integers A, B and prints A+B.

Takahashi, who is taking this exam, suddenly forgets his age.

He decides to write a program that first receives his age N (1 or 2) as input, then prints Hello World if N=1, and additionally receives integers A, B and prints A+B if N=2.

Write this program for him.

Constraints

N is 1 or 2.

A is an integer between 1 and 9 (inclusive).

B is an integer between 1 and 9 (inclusive).

Input

Input is given from Standard Input in one of the following formats:

1

2
A
B

Output

If N=1, print Hello World; if N=2, print A+B.

Sample Input 1

1

Sample Output 1

Hello World

As N=1, Takahashi is one year old. Thus, we should print Hello World.

Sample Input 2

2
3
5

Sample Output 2

8

As N=2, Takahashi is two years old. Thus, we should print A+B, which is 8 since A=3 and B=5.

Solution in Java8 (OpenJDK 1.8.0) (judge verdict: Runtime Error)

    import java.util.Scanner;
    import java.io.BufferedReader;
    import java.util.*;
     
    public class Main {
        public static void main(String[] args){
     
            Scanner sc = new Scanner(System.in);

            String N = sc.next();
            String A = sc.next();
            String B = sc.next();

            if ((A == null) || ( B == null)) {
            	A = "0";
            	B = "0";
             }
            
            
            
            int nValue = Integer.parseInt(N);
            int aValue = Integer.parseInt(A);
            int bValue = Integer.parseInt(B);

            String ans1 = "Hello World";

     
             int n1 = 1;
             
             int ans2 = aValue+bValue;
             

             
             if( nValue == n1){
            	System.out.println(ans1);
            
            } else{
            	System.out.println(ans2);        	     
            }
        }
      }